Phreatia Lindley (1830: 63)

Averyanov, Leonid V., Nguyen, Van Canh, Vuong, Truong Ba, Nuraliev, Maxim S., Nguyen, Khang Sinh, Maisak, Tatiana V., Yudova, Daria A., Saidov, Nikita T., Nguyen, Cuong Huu & Nong, Duy Van, 2024, New orchids in the flora of Vietnam VIII (Orchidaceae: Epidendroideae, tribes Malaxideae, Neottieae and Podochileae), Phytotaxa 658 (1), pp. 1-49 : 40

Phreatia Lindley (1830: 63)

Phreatia sulcata (Blume) Smith (1905: 505) , Holttum (1964: 552), Backer & Bakhuizen van den Brink (1968: 323), Seidenfaden (1986b: 149), Comber (1990: 207, 2001: 567), Seidenfaden & Wood (1992: 342), Wood & Cribb (1994: 236).

( Fig. 19D–F )

≡ Dendrolirium sulcatum Blume (1825: 347) .

Type: — INDONESIA. West Java: Gede, Blume s.n. (holotype BO, fide Wood & Cribb 1994).

Ecology and phenology in Vietnam: —Clustering epiphyte. Primary and old secondary humid evergreen broad-leaved montane forests on granite at elevations of 1500–1600 m a.s.l. Very rare. Flowers in May–June.

Distribution: — Vietnam: provinces Khanh Hoa (Hon Ba Mountains) and Lam Dong (Bidoup Mountains). Thailand, Peninsular Malaysia, Sumatra, Java, Borneo, the Philippines, Lesser Sunda Islands.

Conservation status in Vietnam: —The species was recorded from two locations within the country, i.e. in Hon Ba and Bidoup mountains. Both these areas are legally protected at a national level, belonging to the Hon Ba Nature Reserve and Bidoup-Nui Ba National Park. Meanwhile, the extent and quality of habitats in these areas severely decrease due to fractional logging, road construction and agricultural activity. Taking into consideration the small number of observed plants, we estimate the national conservation status of the species as Near Threatened (NT). The conservation status of this species outside Vietnam has never been evaluated.

Notes: — Phreatia sulcata is reported here as a new record for the flora of Vietnam. The species was earlier known to have a broad distribution in Malesia and also in central Thailand, which made its occurrence in southern Vietnam rather expectable. Phreatia sulcata is quite distinct from the other mainland species of the genus in its pseudobulbous stem and long inflorescence, which is more than twice as long as the leaves.

Studied specimens:— VIETNAM. Khanh Hoa Province: Hon Ba Mountains, June 2011, Jana Leong-Škorničková s.n. (photos LE LE01122200 https://en.herbariumle.ru/?t=occ&id=82673). VIETNAM. Lam Dong Province: Bidoup Mountains, at elevation of 1600 m a.s.l., May 2010, Nong Van Duy 578 (photos LE LE01090851 https://en.herbariumle. ru/?t=occ&id=81376).

Figures

FIGURE 19. A–C. Eria dacrydium var. cornuta. Photos by L. Averyanov from the specimen L. Averyanov et al., AL2103 (A, B) and by Truong Ba Vuong from the specimen Truong Ba Vuong Dang, BV842 (C). D–F. Phreatia sulcata. Photos by Nong Van Duy from the specimen N.V. Duy 578 (D, E) and J. Leong-Škorničková from specimen Leong-Škorničková s.n. (F). Photo correction and design by L. Averyanov.