Arethuseae

Averyanov, Leonid V., Nguyen, Van Canh, Truong, Ba Vuong, Nguyen, Khang Sinh, Nguyen, Cuong Huu, Maisak, Tatiana V., Doan, Nga Thi, Nguyen, Tuan Hoang, Pham, Van The, Dat, Pham Thi Thanh, Thai, Tran Huy, Nguyen, Van Khuong & Trinh, Ngoc Bon, 2023, New orchids in the flora of Vietnam VI (Orchidaceae, tribes Arethuseae, Cymbidieae, Diurideae, Epidendreae, Vandeae, and Vanilleae), Phytotaxa 597 (2), pp. 87-110 : 88-89

Tribe Arethuseae

Coelogyne fuliginosa Lodd. ex Hooker (1849 t. 4440), Seidenfaden (1975: 19, fig. 4 & 5), Comber (1990: 112), Pearce & Cribb (2002: 327), Clayton (2002: 52, pl. 3B). Type:— INDIA. Loddiges collector 1838 s.n. (holotype K “ Coelogyne fuliginosa m Herb. Loddiges” no barcode, specimen on herbarium sheet K000079262).

Ecology and phenology:—Lithophyte and epiphyte on tall mossy trees, commonly along streams. Primary and secondary evergreen broad-leaved montane forests on limestone and granite at an elevation of 1000–1300 m a.s.l. Occasional. Flowers in February and September.

Distribution:— Vietnam, provinces Hoa Binh (with no exact location), and Lam Dong (Lac Duong District). Bhutan, NE India, Myanmar, Java?

Conservation status:—The evaluation of this species by the criteria proposed by the Red List ICUN (2019) is based on two poor collections, which give insufficient data to identify a certain conservation status. Hence, the national conservation status for this species should be identified as nationally Data Deficient (DD). Outside Vietnam, the species status should be designated as NE.

Notes:—The species is very close to Coelogyne fimbriata Lindley (1825 t. 868) and Coelogyne ovalis Lindley (1838: 91) , with which it is synonymized by some recent authors ( Pelser et al. 2000, Schuiteman et al. 2008, Ormerod et al. 2021). However, in a series of monographic works, it is kept as a separate species ( Seidenfaden 1975, Pearce & Cribb 2002, Clayton 2002: 52). With some uncertainty, we also keep it separately in Vietnam before studying more collections from Eastern Indochina. The plant reported for Java ( Comber 1990) has flowers twice as large as those reported in the protologue and most probably represents another species, rather than belonging to the Coelogyne sect. Speciosae Pfitzer & Kraenzlin in Engler (1907: 28) rather than C. sect. Fuliginosae Pfitzer & Kraenzlin l.c. (1907: 33).

Studied specimens:— VIETNAM, limestone area in Hoa Binh Province, September 2014, Chu Xuan Canh, s.n. ( LE01059405 https://en.herbariumle.ru/?t=occ&id=10290) . VIETNAM, Lam Dong Province, Lac Duong District, Lat Municipality, Pang Tien Village , around point 11°38´35´´N 108°18´44´´E, remnants of primary evergreen, humid montane forest along rocky mountain stream at an elevation of about 1250 m a.s.l., lithophyte on mossy granite cliff, also as an epiphyte on old trees, 1 May 2015, L. Averyanov, T. Maisak, Nguyen Phi Tam, Nong Van Duy, flowered in cultivation on 15 February 2017, flowers light greenish-yellow, lip with dark brown keels and irregular marks in the center, L. Averyanov, AL 054 ( LE01077606 https://en.herbariumle.ru/?t=occ&id=115161) .