Ascocentropsis malipoensis (Liu Z.-J. & Chen L.-J.) Averyanov

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 : 114

Ascocentropsis malipoensis (Liu Z.-J. & Chen L.-J.) Averyanov in Averyanov et al. (2018d: 123).

≡ Singchia malipoensis Liu Z. -J. & Chen L.-J. (2009: 602); Cleisocentron malipoense (Z.J.Liu & L.J.Chen) R.Rice, (2018: 158) .

( Figs. 1 A, B )

Type: — CHINA. Yunnan: Malipo County, on trees in forest, alt. 1000 m, 27 Aug. 2008, Z. J . Liu 4137 (holotype – NOCC) .

Habitat, phenology and conservation status: —Epiphyte. Broad-leaved evergreen submontane forests on karstic limestone at elevation about 1000 m a.s.l. Fl. October–November. Very rare. Suggested IUCN Red List status – EN.

Distribution: —Northern Vietnam (Ha Giang and Lai Chau provinces), SE China (SE Yunnan).

Note: —According to available data, this very rare species has been found only in three documented locations in SE Yunnan ( China) and in two provinces of N Vietnam (Ha Giang and Lai Chau) geographically forming triangle with approximate sides 200×200× 40 km and lying along the Vietnamese – Chinese border. In terms of the IUCN Red List, the species has an estimated area of occurrence (EOO) less than 4000 km 2 and area of occupancy (AOO) is 12 km 2. There is continuing decline in the quality of habitat due to intensive deforestation and agricultural exploration throughout occurrence area. The wide loss of habitats and commercial collecting are strong factors affected the species’ population and bringing the number of mature individuals down. Hence, the species is assessed as Endangered – EN B2ab(iii, v) according to formal IUCN criteria ( IUCN 2019).

Studied specimens: — VIETNAM, Lai Chau Province, broad-leaved limestone forest, plant collected by local collector for Mr. Loc Bao Sang, who cultivated plant in his private garden in Lam Dong, Di Linh Town, 26 October 2019, L. Averyanov, Nguyen Van Canh , T. Maisak, AL 1187 (LE01066616 http://en.herbariumle.ru/?t=occ&id=12384, LE01088196 https://en.herbariumle.ru/?t=occ&id=43730). VIETNAM, the plant was purchased mixed with Renanthera vietnamensis , originating from Ha Giang Province, Quang Ba District and cultivated in Dalat Town, Lam Dong Province by Mr. Nguyen Phi Tam s.n., photo of 08.11.2021, AL 1295 (LE01123004 https://en.herbariumle. ru/?t=occ&id=110370).

Figures

FIGURE 1. Ascocentropsis malipoensis. A. Flowering plant (AL 1295), B. Flower, half side view (AL 1187). Chiloschista parishii var. minutiflora. C. Inflorescence. D. Portion of inflorescence with fully open flowers (Nguyen Van Canh, Nguyen Hoang Tuan, s.n.). Chiloschista sweelimii. E–G. Flowering plant, inflorescence and flower, half side view (Nguyen Van Canh s.n.). Cleisostoma equestre. H. Flowering plant, I. Flower, frontal view (AL 1123a). Photos by Nguyen Phi Tam (A), L. Averyanov (B), Nguyen Van Canh (C, D, H, I), and anonymous photo (E–G).