Pomatocalpa undulatum (Lindley) J.J. Smith (1912: 107)

Averyanov, Leonid V., Thai, Tran Huy, Truong, Ba Vuong, Nguyen, Van Canh, Nguyen, Tuan Hoang, Maisak, Tatiana V., Nguyen, Khang Sinh & Nguyen, Van Khuong, 2022, New orchids in the flora of Vietnam (Orchidaceae, Aeridinae), Phytotaxa 555 (2), pp. 113-135 : 126-127

Pomatocalpa undulatum (Lindley) J.J. Smith (1912: 107) .

≡ Saccolabium undulatum Lindley (1833: 222) .

( Figs. 8 A, B )

Type: — BANGLADESH. Sylhet, Wallich 7301 (syntypes K001127133 & K001127134 ) .

Habitat, phenology and conservation status: —Epiphyte. Broad-leaved evergreen. Fl. February–March. Very rare. Suggested IUCN Red List status – DD.

Distribution: —Northern Vietnam (Thanh Hoa Province, Quan Son District), NE India, Bangladesh, E China.

Note: —The distribution and conservation status of this species here newly recorded from Vietnam remains very unclear. Its discovery in Vietnam is not surprising as it was recorded from adjacent regions of mainland China and from Taiwan ( Zhou et al. 2016, Lin et al. 2016). Meanwhile, without flowers, it may be easily confused with the widespread and common species, P. spicatum Breda (1827 t. 15). Hence, the distribution of this rather unattractive species in Vietnam may be much broader than it is indicated by this single record. As a result, the conservation status of this species should be assessed as the Data Deficient – DD, according to the formal IUCN criteria ( IUCN 2019).

Studied specimens: — VIETNAM, Thanh Hoa Province, Quan Son District, Pu Man Forest , epiphyte, leaf margin undulate, apex unequally 2-lobed, flowers glabrous, slightly fragrant, tepals white, purple spotted, lip white, 26.02.2020, Truong Ba Vuong, BV 517 ( LE01073013 https://en.herbariumle.ru/?t=occ&id=14362) .

Figures

FIGURE 8. Pomatocalpa undulatum. A, B. Inflorescences and flower, frontal view (BV 517). Trachoma rhopalorrhachis. C, D. (AL 335). Trichoglottis maculata. E. Flowering plant (Nguyen Hoang Tuan s.n.). F. Flower, frontal view (BV 685). Photos by Truong Ba Vuong (A, B, F), L. Averyanov (C, D), Nguyen Hoang Tuan (E).