ORCHIDOLOGY

Arunachal Pradesh is the richest in terms of orchid diversity with over 600 species and varieties. In order to develop this natural resource in a sustainable manner, the division of Orchidology is engaged in exploration, documentation, micro-propagation and extension activities aimed at technological development in orchid breeding, farming and floriculture with people’s participation and contribute towards economy of the local people. Significant achievements are:
i. Surveys, documentation and habitat studies of orchids – 550 species
ii. Compilation of Orchid flora of the state and development of Herbarium – 3400 specimen.
iii. Discovering and describing 30 new species, 01 new genus and 150 new records of occurrence.
iv. Establishment of Sessa Orchid Sanctuary – 100 km2 for in-situ conservation.
v. Establishment of Orchidaria in six different zones for ex-situ conservation.
vi. Recognition of Orchid Research Centre Tipi as one of the DUS testing centres for orchids in India.
vii. Cultivation and propagation of over two lakh orchids.
viii. Establishment of Tissue culture Laboratory at Tipi.
ix. Standardization of tissue culture techniques of high altitude medicinal orchids like Cremastra appendiculata (D.Don) Makino, Pleione maculata (Lindl.) Lindl. & Paxton, Malaxis muscifera (Lindl.) kuntze (Syn. Dienia muscifera Lindl.) were successfully developed.
x. Breeding and development of 15 hybrids; Five new hybrids registered viz.i).Renades ‘Arunoday’, ii). Arachnocentron ‘Tipi Jubilee Star’, iii). Esmeranda ‘Millenium Dawn’, iv). Ascocenda ‘Tipi Blue boy’ and v). Cymbidium ‘Sessa Green Beauty’.
xi. Induction of polyploidy in fourVandaceous genera.
xii. Extension and development of six Cymbidium farms involving local entrepreneurs and women.
xiii. Introducing capsule course in tissue culture of Orchids.
xiv. Organizing Festival of Flowers.
xv. Publication of three books, two booklets, 133journalarticles, several folders, stickers and publicity materials.
xvi. Development of ORC, Tipi as a Botanic Garden and Tourist Center.
xvii. During the year 2003 – 2016, eight externally funded projects in addition to state plan project have been carried out under the Orchidology division.
A. STATE PLAN PROJECT ON CONSERVATION
i. In-situ conservation: About 200 native species are being conserved in situ at Sessa Orchid Sanctuary.
ii. Ex-situ conservation: As a part of ex-situ conservation number of orchids of different species have been rescued from degraded forest areas of various districts in Arunachal Pradesh and brought under cultivation at Tipi and Itanagar orchidarium and Orchid Sanctuary Sessa.
iii. Enrichment of germplasm:To enrich the existing germplasm at ORC, Tipi, new species are collected from within or outside the states on exchange basis.
iv. Multiplication: Both micro-propagation and vegetative multiplications are continuously done throughout the year.
B. ONGOING EXTERNALLY FUNDED PROJECT i. DBT Project: Medicinal Orchids of Arunachal Pradesh: Micropropagation, phytochemical characterization and biological activity evaluation.
ii. DUS Testing Project: DUS testing of orchid varieties/ species for development of NTG (National Test Guidelines).
C. EXTENSION SERVICES
i. As an integral part of research activities, externally funded project was started in 1990 on subtropical orchid (Cymbidium) farming in farmers’ land with hardened seedlings from laboratory (lab to land). Since then several orchid farms have been developed with trainings in their land.
ii. Imparted training to tribal farmers belonging from Bhalukpong, Jamiri, Paliji, Dambuk, Jairampur, Seppa and Naharlagun area in Vanilla commercial farming at Myladumpara, Kerala under the sponsorship of Spice Board, Cochin, Kerala during 2003.
iii. Under various centrally sponsored projects (ICAR, NRC, DBT, ICFRE, etc.) batch wise training on orchid cultivation and related parameters like post-harvest techniques, packaging techniques, grading, transportation, marketing, international market values, hybrid types and CITES were imparted to local farmers inhaling from different districts of the state.
iv. Training to students of different institutes including Oxford College of Science(Bangalore), Assam Industrial Development Corporation (Guwahati),Silviculture Division of Forest Department (Sikkim), Division of West Bengal Forest Development Corporation Limited (Kalimpong),Green Heritage- NGO (North Lakhimpur), Darang College (Assam), North East Regional Institute of Science and Technology (Nirjuli) and Rajiv Gandhi University (Itanagar).
v. Delivered lectures on orchid diversity, conservation, propagation and commercial farming including IUCN cites rules and regulations and practical demonstrations to the following batches of forest officials at ORC, Tipi.
1) ACF Probationers of 2016 course of Central Academy for State Forest Service, Dehradun.
2) RFO Probationers of 2017 course of Eastern Forest Rangers College, Kurseong.
vi. Publications of booklets, farmers’ guide, cultivation technique, folders, etc. to create awareness & dissemination of knowledge among orchid farmers, lovers, hobbyists, etc.

D. VISITORS
More than 9700 tourists and other dignitaries have visited ORC, Tipi during the year 2016-17.
E. PERSONNEL
Scientific staff
Dr. Jambey Tsering, Scientist ‘B’
Technical staff
Shri Jumter Nyorak, Laboratory Assistant
Field Staffs
Smt Yani Nyodu, Range Forests Officer
Shri Bikash Bhowmik, Forester
Shri Modi Dusoso, Forester
Shri Tani Tayer, Forester
Smt K. Tipitini, Forest Guard
Smt Y.D. Lapung, Forest Guard
Shri Taba Tayo, Mali
Shri P.K. Bora, Mali
Shri Md. A.M. Saikia, Mali
Shri D. Tiwari, Mali
Shri A.C. Nath, Mali
Shri Pura Doku, Mali
F. PUBLICATONS (journal article)
1. Hegde, S.N., 1979. Orchid conservation and commercialization strategies in Arunachal Pradesh. Arunachal Forest News. 2(8), 14-19.
2. Hegde, S.N., 1980. Preliminary observations and list of orchids of A.P. Arunachal Forest News, 3(3) 1-11.
3. Rao, A.S., Deori, N.C., 1980. A preliminary census of the orchids of Kameng district, Arunachal Pradesh. Indian Journal of Forestry. 3(3), 255-260.
4. Hegde, S.N., 1981. Contribution to the biosystematics in the sub-tribe Liparidinae Benth (Orchidaceae) with particular reference to South Indian species. Bulletin of the Botanical Survey of India. 23(3&4), 217-225.
5. Hegde, S.N., 1981. Cultivation and conservation of lost orchid. Indian Horticulture. 25(4) 7-9.
6. Hegde, S.N., 1981. Three saprophytic orchids from Arunachal Pradesh. American Orchid Society Bulletin. 50(10), 1220-1222.
7. Hegde, S.N., Rao, A.N., 1982. Three rare and little known orchids from Arunachal Pradesh. Indian Journal of Forestry. 5(4), 311-314.
8. Hegde, S.N., Rao, A.N., 1982. Dendrobium kentrophyllum Hook.f.- a new record from Arunachal Pradesh. Orchid Review. 90(1070), 386-387.
9. Hegde, S.N., Rao, A.N., 1982. Epipogium sessanum Hegde et Rao- a new species of orchids from Arunachal Pradesh. Journal of Economic and Taxonomic Botany. 3, 597-601.
10. Hegde, S.N., Rao, A.N., 1982. Herminium longilobatum Hegde et Rao- a new species of orchid from Arunachal Pradesh, India. Himalayan Plant Journal. 1(2), 46-48.
11. Joseph, J., Hegde, S.N., Abbareddy, N.R., 1982. Eria connata Joseph, Hegde et Abhareddy- a new species orchid from Kameng District, Arunachal Pradesh, India. In Bulletin of Botanical Survey of India. 24(1-4), 114-116.
12. Hegde, S.N., Rao, A.N., 1983. Further contributions to the Orchid Flora of Arunachal Pradesh-1. Journal of Economic and Taxonomic Botany. 4(2), 383-392.
13. Hegde, S.N., Rao, A.N., 1983. Cleisostoma tricallosum Hegde et Rao- a new orchid from Arunachal Pradesh, India. The Orchid Review. 91, 54-55.
14. Hegde, S.N., Rao, A.N., 1984. Biermannia jainiana Hegde et Nageswara Rao- a new species of orchid from Arunachal Pradesh, India. Bulletin of Botanical Survey of India. 26 (1&2), 97-99.
15. Hegde, S.N., Rao, A.N., 1984. Further contributions to the orchid Flora of Arunachal Pradesh-2. Indian Journal of Forestry. 7(1), 76-79.
16. Hegde, S.N., Shadang, R., 1984. Flowering gems of Northeast Forests. Arunachal Now. 1, 20-25.
17. Rao, A.N., Hegde, S.N., 1984. A note on the correct identity of Eria hindei Summerh. (Orchidaceae). Kew Bulletin. 39(3), 635-637.
18. Hegde, S.N., 1985. Observations on the habitat distribution of Orchids of Arunachal Pradesh. Journal of Bombay Natural History Society. 82(1), 114-125.
19. Hegde, S.N., 1985. Studies in the genus Apostasia Blume from Arunachal Pradesh. Indian Orchid Journal. 1(4), 141-148.
20. Hegde, S.N., Ingalhalli, R.S., 1985. IOBP chromosome number reports LXXXVIII. Taxon. 34(3), 546-551.
21. Hegde, S.N., Ingalhalli, R.S., 1985. Preliminary observations and trials on breeding of some native orchids of Arunachal Pradesh. In Vij, S.P., Eds. Biology, Conservation and Culture of Orchids. East-West Press, New Delhi, pp. 109-119.
22. Hegde, S.N., Rao, A.N, 1985. Gastrodia arunachalensis Hegde and Nageswara Rao- a new orchid from Arunachal Pradesh, India. Orchid Review. 93(1099), 171-172.
23. Hegde, S.N., Rao, A.N., 1985. Two new records from Orchid Sanctuary Sessa, Arunachal Pradesh. Indian Journal of Forestry. 3(5), 15-17.
24. Naithani, H.B., Rao, A.N., Haridasan, K., 1985. Some additions to the orchid flora of Arunachal Pradesh. Indian Journal of Forestry. 3(4), 333-334.
25. Rao, A.N., 1985. A note on the correct identity of Bulbophyllum uniflorumGriff. (Orchidaceae). Indian Journal of Forestry. 8(1), 154-157.
26. Rao, A.N., 1985. Habenaria seshagirianaNageswara Rao- a new name of H. polytricha(Hook.f.) Pradhan (Orchidaceae). Journal of Economic and Taxonomic Botany. 6(1), 223-226.
27. Rao, A.N., 1986. Orchid Flora of Arunachal Pradesh- a conspectus. In Vij, S.P., Eds. Biology, Conservation and Culture of Orchids, East-West Press, New Delhi.
28. Hegde, S.N. 1987. Cymbidium eburneum Lindl. and Cymbidium hookeriannum Rchb.f. In Nayar, M.P., Sastry, A.P.K., Eds. Red Data Book of Indian Plants, pp. 240-241.
29. Hegde, S.N., 1987. Development of Orchidology as plant and cut-flowers trade industry in the North-Eastern Region vis-a-vis Arunachal Pradesh. Arunachal Forest News. 5(2), 52-66.
30. Hegde, S.N., 1987. Progress in orchid Research & Development in Arunachal Pradesh: A report. Arunachal Forest News. 5(1), 13-17.
31. Hegde, S.N., Rao, A.N., 1987. Further contributions to the orchid Flora of Arunachal Pradesh-3. Indian Journal of Forestry. 10(3), 191-198.
32. Hegde, S.N., Rao, A.N., 1987. Two orchids new to Arunachal Pradesh. Arunachal Forest News. 5(1), 34.
33. Rao, A. N., 1987. A note on the sectional delineation in the genus Epipogium R.Br. (Orchidaceae). Indian Orchid Journal. 2(1), 13-18.
34. Rao, A.N., Hegde, S.N., 1988. Two orchids new to India from Arunachal Pradesh. Arunachal Forest News. 6(2), 60-63.
35. Rao, A.N., Swaminathan, M.S., 1987. Diplomeris josephiiNageswara Rao etSwaminathan- a new orchid from Arunachal Pradesh. Indian Orchid Journal. 2(1), 5-7.
36. Hegde, S.N., 1988. Cephalanthera damasonium in Arunachal Pradesh, India. The Orchid Review. 150.
37. Hegde, S.N., 1988. Coptisteeta Wall (Mishmi teeta)- a rare medicinal plant from Arunachal Pradesh. Arunachal Forest News. 6(1), 27-29.
38. Hegde, S.N., Ingalhalli, R.S., 1988. A note on the medicinal usage of some orchids. Arunachal Forest News. 6(1), 11-18.
39. Hegde, S.N., Ingalhalli, R.S., 1988. IOBP Chromosome number reports XCVIII. Taxon. 37(1), 194-196.
40. Hegde, S.N., Rao, A.N., Ingalhalli, R.S., Ahmed, N., 1988. Culture Notes from Orchid R&D Centre, Tipi-I: Seed and Tissue-culture of Cymbidium hybrid- C. Iridioides × C. longifolium. Arunachal Forest News. 6(2), 64-71.
41. Rao, A.N., 1988. A taxonomic review of the saprophytic orchids of Arunachal Pradesh, India. The Journal of Orchid Society of India. 2(1&2), 9-18.
42. Rao, A.N., 1988. Two new species of Cheirostylis (Orchidaceae) from Arunachal Pradesh, India. Nordic Journal of Botany. 8(4) 339-340.
43. Rao, A.N., 1988. Zeuxine clandestina Bl. (Orchidaceae)- a new record to India. The Indian Forester. 114(2), 95-97.
44. Rao, A.N., 1988. Zeuxine lindleyanaNageswara Rao- a new orchid from Arunachal Pradesh, India. Arunachal Forest News. 6(1), 34-36.
45. Rao, A.N., Haridasan, K., Hegde. S.N., 1988. Eria lohitensis Nageswara Rao, Haridasanet. Hegde- a new species of orchid form Arunachal Pradesh. Journal of Bombay Natural History Society. 86(2), 229.
46. Haridasan, K., Rao, A.N., Hegde, S.N., 1989. Some additions to the orchid flora of Arunachal. Journal of Economic and Taxonomic Botany. 12(1), 110-112.
47. Hegde, S.N., Rao, A.N., 1989. Studies in the genus Bulbophllum Thou. (Orchidaceae) of Arunachal Pradesh, India. Arunachal Forest News. 7(1&2), 51-70.
48. Rao, A.N., 1989. A note on the identity of Diglyphosamacrophylla. The Journal of Orchid Society of India. 3(1&2), 47-49.
49. Hegde, S.N., 1990. Renades “Arunodaya”- a hybrid of Aerides rosea × Renanthera imschootiana. The Orchid Review. 98, 1166.
50. Hegde, S.N., 1990. Studies on three species of the genus Acanthephippium Blume in Arunachal Pradesh. Arunachal Forest News. 8(1&2), 26- 33.
51. Hegde, S.N., Rao, A.N., Ingalhalli, R.S., Ahmed, N., 1990. Culture notes from R&D centre, Tipi-3: Breeding and in vitro culture of Vandaceous Orchids- Aerides rosea × Renanthera imschootiana (×Renades). Arunachal Forest News. 7(1&2), 32-42.
52. Rao, A.N., 1990. A new species of Sarcoglyphis (Orchidaceae) from Arunachal Pradesh, India. Nordic Journal of Botany. 10, 161-162.
53. Rao, A.N., 1990. Dendrobium manniiRidl.- a rare orchid new to Arunachal Pradesh, India. Journal of Economic and Taxonomic Botany. 14(2), 469-470.
54. Haridasan, K., Hegde, S.N., 1991. The genus Hedychium in Arunachal Pradesh- its distribution and Ecology. Arunachal Forest News. 9(1), 1-4.
55. Hegde, S.N., 1991. Orchid cultivation in Arunachal Pradesh- some observations. Journal of Orchid Society of India. 5(1&2), 71-84.
56. Hegde, S.N., 1991. Orchids from Lab to field in Arunachal Pradesh. Arunachal Forest News. 9(1), 23-37.
57. Hegde, S.N., 1991. Paphiopedilum venustum (Wall.) pfitz. Exstein- a new addition to Arunachal Pradesh. Arunachal Forest News. 9(2), 11-16.
58. Rao, A.N., 1991. Cheirostylis tippicaNageswara Rao- a new species of orchids from Arunachal Pradesh, India. Arunachal Forest News. 9(2), 17-20.
59. Rao, A.N., 1991. Epipogium africanusSchltr. (Orchidaceae)- a new record to India. Higher Plant of Indian Subcontinent (Additional series of Indian Journal of Forestry No. V). 2, 9-12.
60. Rao, A.N., 1991. Post-independence additions to the orchid flora of India with a particular reference to Arunachal Pradesh- a review. The Journal of Orchid Society of India. 5(1&2), 29-41.
61. Rao, A.N., 1997. A new species of Gastrodia from Arunachal Pradesh (India). The Journal of Orchid Society of India. 11(1), 1-2.
62. Rao, A.N., Haridasan, K., Hegde, S.N., 1991. A new species of Gastrodia from Arunachal Pradesh, India. Arunachal Forest News. 9(1), 10-12.
63. Rao, A.N., Haridasan, K., Hegde, S.N., 1991. A new species of orchid species of Gastrodia from Arunachal Pradesh, India. Arunachal Forest News. 9(1), 10-12.
64. Rao, A.N., Haridasan, K., Hegde, S.N., 1991. A new species of Gastrodia from Arunachal Pradesh, India. Arunachal Forest News. 9(1), 10-12.
65. Rao, A.N., Lal, J., 1991. A new species of Taeniophyllum Bl. (Orchidaceae) from Arunachal Pradesh, India. Bioved. 2(2), 25-26.
66. Hegde, S.N., Rao, A.N., Ahmed, N., 1992. Further notes on Sessa Orchid Sanctuary, Arunachal Pradesh. The Journal of Orchid Society of India. 6(1&2), 31-40.
67. Hegde, S.N., Thapliyal, G.S., 1992. Prospect and problems of commercialization of orchids from Arunachal Pradesh. Arunachal Forest News. 10(1& 2), 43-55.
68. Rao, A.N., 1992. A new species of Nervilia Gaud. (Orchidaceae) from Garhwal Himalaya (India). The Indian Forester. 118(11), 846-847.
69. Rao, A.N., 1992. A note on the identity of two Bulbophyllum species. The Journal of Orchid Society of India. 6(1&2), 41-42.
70. Rao, A.N., 1992. Does Arachnis flosaeris (L.) Rchb.f. (Orchidaceae) occur in Arunachal Pradesh. Arunachal Forest News. 10(1&2), 61-62.
71. Rao, A.N., 1992. Two new species of orchids from Arunachal Pradesh. Journal of Economic and Taxonomic Botany. 16(3), 723-726.
72. Hegde, S.N., 1993. Eria cristata Rolfe (Orchidaceae)- a new record to India from Arunachal Pradesh. Arunachal Forest News. 11(2), 4-7.
73. Hegde, S.N., 1993. Eria jengingensis Hegde- a new species of orchids from Arunachal Pradesh, India. The Journal of Orchid Society of India. 7(1&2), 13-16
. 74. Rao, A.N., Hegde, S.N., 1993. Observation on pests and diseases on some orchids of Arunachal Pradesh: India. 11(2), 19-26.
75. Rao, A.N., 1994. Bulbophyllum crassipesHk.f. (Orchidaceae)- a new record to Arunachal Pradesh. Arunachal Forest News. 12(1), 25-26.
76. Haridasan, K., Rao, A.N., 1995. Dendrobium monticola- a miniature orchid new to N.E. India from Arunachal Pradesh. 13(1&2), 35-36.
77. Hegde, S.N., 1995. Technique of orchid seed and tissue culture. Arunachal Forest News. 13(1&2), 40-54.
78. Hegde, S.N., 1995. Thrixspermum muscacflorum Rao &Jospal- a new record to Arunachal Pradesh India. Journal of Economic and Taxonomic Botany (Additional series-II), 121-123.
79. Rao, A.N., 1995. Four new records of orchids from Arunachal Pradesh, India. Journal of Economic and Taxonomic Botany (Additional series-II), 125-126.
80. Rao, A.N., 1995. New contributions to the Orchid Flora of N.E. India during 1950-1990, with special reference to Arunachal Pradesh- a review. Journal of Economic and Taxonomic Botany (Additional series-II). 49-63.
81. Rao, A.N., 1995. Two ground orchid species new to Arunachal Pradesh (India). Journal of Economic and Taxonomic Botany. 19(3), 637-638.
82. Hegde, S.N., 1996. Orchid wealth of India. Arunachal Forest News. 14(1), 6-19.
83. Hegde, S.N., 1996. Orchids- the Treasure of Arunachal. The Eastern News line. 1(5), 45-47.
84. Rao, A.N., 1996. Five new records of orchids from Arunachal Pradesh, India. Journal of Economic and Taxonomic Botany. 20(3), 707-709.
85. Rao, A.N., 1996. Four new records of orchids from Arunachal Pradesh, India. Indian Forester. 122(12), 1171-1173.
86. Rao, A.N., 1996. Herminiummonophyllum (Orchidaceae)- a new record to N.E. India from Arunachal Pradesh. Journal of Economic and Taxonomic Botany. 20(1), 223-224.
87. Rao, A.N., 1996. Oberonia katakianaNageswara Rao- a new orchid species from Arunachal Pradesh, India. Journal of Economic and Taxonomic Botany. 20(3), 711-713.
88. Rao, A.N., Saikia, D.K., 1996. Calanthe pachystalix Rchb.f. ex Hook.f.- a new orchid record from N.E. India from Arunachal Pradesh. Journal of Economic and Taxonomic Botany. 20(3), 665-667.
89. Hegde, S.N., Saikia, D.K., Ahmed, N., Rao, A.N., 1997. Micropropagation and farming of Cymbidium orchids in jhum/waste lands of Arunachal Pradesh. Arunachal Forest News.15(1&2), 15-28.
90. Rao, A.N., 1997. A new species and some new records of orchids from Arunachal Pradesh, India. Rheedea. 7(2), 127-132.
91. Rao, A.N., 1997. A new species of Ione Lind. (Orchidaceae) from Arunachal Pradesh, India. Rheedea. 7(1), 47-50.
92. Rao, A.N., 1997. Eriaarunachalensis Nageswara Rao- a new orchid from India. Journal of Economic and Taxonomic Botany. 21(3), 711-713.
93. Rao, A.N., 1997. Erythrodes seshagirianaNageswara Rao- a new species of orchids from Arunachal Pradesh, India. Indian Forester. 123(7), 643- 645.
94. Rao, A.N., 1997. Four new records of orchids to Arunachal Pradesh (India). Journal of Economic and Taxonomic Botany. 21(3), 717-719.
95. Sinha, S.K., Hegde, S.N., 1997. Regenerative competence of Aerides rosea Loddiges ex Paxt. from axillary bud: A study in vitro. Arunachal Forest News. 15(1&2), 47-50.
96. Ahmed, N., Rao, A.N., Hegde, S.N., 1998. Clonal propagation of RenadesArunodaya through aseptic culture of inflorescence. Arunachal Forest News. 16(1&2), 25-31.
97. Rao, A.N., 1998. Cheirostylis gunnariiNageswara Rao (Orchidaceae)- a new orchid from Arunachal Pradesh, India. Nordic Journal of Botany. 18, 23-25.
98. Rao, A.N., 1998. Gastrochilus rutilansSeidenf. (Orchidaceae)- a new record to India from Arunachal Pradesh. Journal of Economic and Taxonomic Botany. 22(1), 239-240.
99. Rao, A.N., 1998. India arunachalensisNageswara Rao (Orchidaceae)- a new genus and species from Arunachal Pradesh, India. Journal of Economic and Taxonomic Botany. 22(3), 701-703.
100. Rao, A.N., 1998. Notes on the genus Taeniophyllum (Orchidaceae) in Arunachal Pradesh with two new records to India. Rheedia. 8(2), 163-166.
101. Rao, A.N., 1998. Rhomboda arunachalensisNageswara Rao- a new species of orchid from Arunachal Pradesh, India. Journal of Economic and Taxonomic Botany. 22(2), 426-428.
102. Rao, A.N., 1998. Two Monopodial orchid species new to Arunachal Pradesh (India). Journal of Economic and Taxonomic Botany. 22(2), 405-406.
103. Sinha, S.K., Singh, S.L., Hegde, S.N., 1998. In vitro multiplication of Aerides rosea Loddiges ex Paxt. through asymbiotic seed germination. Arunachal Forest News. 16(1&2), 38-44.
104. Hegde, S.N., 1999. Conservation of North East Flora. Arunachal Forest News, 18(1&2), 5-26.
105. Hegde, S.N., Apang, O., 1999. Tourism importance of orchids of Arunachal Pradesh. Arunachal Forest News. 17(1&2): 17-21.
106. Singh, L.S., Hegde, S.N., 1999. Orchid Mycorrhiza: An amazing symbiotic relationship. Arunachal Forest News. 17(1&2).
107. Rao, A.N., 2000. Notes on some new additions and nomenclatural changes in two orchids of Arunachal Pradesh. The Journal of Orchid Society of India. 14, 61-66.
108. Rao, A.N., 2000. Notes on some new records of orchids from Arunachal Pradesh. Journal of Economic and Taxonomic Botany. 24(2), 261-264.
109. Rao, A.N., 2000. Oberonia kamlangensisNageswara Rao- a new orchid from Arunachal Pradesh. Journal of Economic and Taxonomic Botany. 24(2), 267-269.
110. Rao, A.N., 2000. Report on some new records of orchids to Arunachal Pradesh (India). Journal of Economic and Taxonomic Botany. 24(1), 213-214.
111. Hegde, S.N., 2001. Prospects of floriculture industry in Arunachal Pradesh with special reference to orchids. Arunachal Forest News. 19(1&2), 172-185.
112. Rao, A.N., 2001. Cheirostylis yunnanensis Rolfe (Orchidaceae)- a new record to India from Arunachal Pradesh. Arunachal Forest News. 19(1&2), 122-125.
113. Rao, A.N., 2001. Herminium kamengensisNageswara Rao- a new orchid species from Arunachal Pradesh. Journal of Economic and Taxonomic Botany. 25(2), 287-289.
114. Rao, A.N., 2001. Rediscovery of Bulbophyllum bisetum Lindl. (Orchidaceae) after a century from North East India. Journal of Economic and Taxonomic Botany. 25(2), 290-292.
115. Rao, A.N., 2002. Eria kamlangensisNageswara Rao (Orchidaceae)- a new orchid from Arunachal Pradesh. The Journal of Orchid Society of India. 15(1&2), 61-63.
116. Rao, A.N., 2004. CirrhopetalumloherianumKranzlin- a new addition to the orchid flora of India from Arunachal Pradesh. Journal of Economic and Taxonomic Botany. 28(3), 555-558.
117. Rao, A.N., Haridasan, K., 2005. Dendrobium vexabileRchb.f. (Orchidaceae)- a new record to India from Arunachal Pradesh. Arunachal Forest News. 21(1&2), 14-16.
118. Rao, A.N., 2006. Alpine orchids of Arunachal Pradesh. Bulletin of Arunachal Forest Research. 22(1&2), 27-32.
119. Rao, A.N., 2006. Variability identification of Paphiopedilum, Anthogonium and some Vandaceous species (Orchidaceae) genotypes- their maintenance and propagation technology. Bulletin of Arunachal Forest Research. 22(1&2), 45-51.
120. Rao, A.N., Chowlu, K., 2006. Contributions to the orchid flora of Kamlang wildlife sanctuary in Lohit district of Arunachal Pradesh. Bulletin of Arunachal Forest Research. 22(1&2), 22-26.
121. Rao, A.N., Ahmed, N., 2007. Observations on pests and diseases of native orchids of Arunachal Pradesh (India)-2. Bulletin of Arunachal Forest Research. 23(1&2) 71-73.
122. Rao, A.N., 2007. Orchid flora of North East India- an update analysis. Bulletin of Arunachal Forest Research. 23(1&2), 6-38.
123. Apang, A.N., Rao, A.N., 2008. Flowering period of some native orchid species in Arunachal Pradesh, India. The Indian Forester. 134(8), 1116-1121.
124. Rao, A.N., 2008. Four new records of orchids to Arunachal Pradesh. Bulletin of Arunachal Forest Research. 24(1&2), 25-28.
125. Rao, A.N., 2009. Epigeneium arunachalenseNageswara Rao- a new orchid from Arunachal Pradesh (India). Bulletin of Arunachal Forest Research. 25(1&2), 3-5.
126. Rao, A.N., 2009. Monopodial Orchids of Arunachal Pradesh (India)- classification, taxonomy, distribution and conservation. Bulletin of Arunachal Forest Research. 25(1&2), 55-92.
127. Rao, A.N., 2010. A review of Orchidaceae genera in Arunachal Pradesh. Bulletin of Arunachal Forest Research. 26(1&2), 1-26.
128. Rao, A.N., 2010. Orchid flora of Arunachal Pradesh an update. Bulletin of Arunachal Forest Research. 26(1&2), 82-110.
129. Rao, A.N., Apang, O., Mao, A.A., Dash, S.S., 2010. Two new records of orchids from Arunachal Pradesh, India. The Journal of Orchid Society of India. 24(1-2), 97-100.
130. Mao, A.A., Rao, A.N., Bhaumik, M., Apang, O., 2011. Thrixspermum saruwatarii (Hayata) Schltr. (Orchidaceaea)- a new record to India from Arunachal Pradesh. Bulletin of Arunachal Forest Research. 27(1&2), 68-70.
131. Rao, A.N., 2011. A review on the subfamily SpiranthoideaeDressl. (Orchidaceae) in Arunachal Pradesh. Bulletin of Arunachal Forest Research. 27(1&2), 1-33.
132. Tag, H., Hui, P.K., Gogoi, B.J., Tam, N., Tsering, J., 2016. Phu: High Altitude Sacred Grove in the Monpa Cultural Landscape of West Arunachal Pradesh (Eastern Himalaya). Journal of Bioresources. 3(2), 28-32.
133. Apang, O., 2017. Tissue culture of high altitude medicinal, rare and endangered orchids – Cremastra appendiculata (D.Don) Makino, Pleione maculata (Lindl.) Lindl. andDienia muscifera Lindl. of Arunachal Pradesh, India. 30-31(1&2), 58-60.

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