New orchids in the flora of Vietnam (Orchidaceae, Aeridinae) Author Averyanov, Leonid V. 0000-0001-8031-2925 Komarov Botanical Institute of the Russian Academy of Sciences, Prof. Popov Str., 2, 197376 St. Petersburg, Russia. & av _ leonid @ mail. ru; https: // orcid. org / 0000 - 0001 - 8031 - 2925 av_leonid@mail.ru Author Thai, Tran Huy 0000-0003-1636-9729 Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18, Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam. & thaiiebr @ yahoo. com. vn; https: // orcid. org / 0000 - 0003 - 1636 - 9729 thaiiebr@yahoo.com.vn Author Nguyen, Van Canh 0000-0001-9578-0342 Institute of Applied Technology, Thu Dau Mot University, No. 6, Tran Van On Street, Phu Hoa Ward, Thu Dau Mot City, Binh Duong Province, Vietnam. & nguyenvancanh @ tdmu. edu. vn; https: // orcid. org / 0000 - 0001 - 9578 - 0342 nguyenvancanh@tdmu.edu.vn Author Truong, Ba Vuong 0000-0003-3452-8455 Institute of Applied Technology, Thu Dau Mot University, No. 6, Tran Van On Street, Phu Hoa Ward, Thu Dau Mot City, Binh Duong Province, Vietnam. & Institute of Tropical Biology Vietnam Academy of Science and Technology, 85 Tran Quoc Toan, District 3, Ho Chi Minh City, Vietnam. Saint-Petersburg State Forest-Technical University, The Institute Lane 5, 195021, St. Petersburg, Russia. & bavuong 2019 @ yahoo. com; https: // orcid. org / 0000 - 0003 - 3452 - 8455 bavuong2019@yahoo.com Author Maisak, Tatiana V. 0000-0001-5919-6755 Komarov Botanical Institute of the Russian Academy of Sciences, Prof. Popov Str., 2, 197376 St. Petersburg, Russia. & tmaisak @ mail. ru; https: // orcid. org / 0000 - 0001 - 5919 - 6755 tmaisak@mail.ru Author Doan, Nga Thi 0000-0002-5685-2953 Vietnam National University of Forestry, Xuan Mai, Chuong My, Hanoi, Vietnam. & doanthinga 1994 hus @ gmail. com; https: // orcid. org / 0000 - 0002 - 5685 - 2953 doanthinga1994hus@gmail.com Author Nguyen, Khang Sinh 0000-0001-5171-4140 Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18, Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam. & Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18, Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam. & nskhang @ gmail. com; https: // orcid. org / 0000 - 0001 - 5171 - 4140 nskhang@gmail.com text Phytotaxa 2022 2022-11-08 572 1 43 60 http://dx.doi.org/10.11646/phytotaxa.572.1.3 journal article 183574 10.11646/phytotaxa.572.1.3 535a1fdf-518a-4e9d-895f-96a3780511b3 1179-3163 7305618 Micropera mannii (Hook.f.) Tang & F.T.Wang (1951: 94) ; Pearce, Cribb (2002: 531 fig. 118). ( Fig. 6A–D ) ≡ Sarcochilus mannii Hooker (1890: 36) . Type :— INDIA . India , Khasia Hills , 2–3000 ft. June 1878 Gustav Mann 11/80 ( holotype K K000942449 ) . ≡ Camarotis mannii (Hook.f.) King, Pantling (1898: 239 tab. 317). Description :— Herb monopodial perennial epiphytic. Stems rigid, pendulous, simple or few branching at the base, (6)8–10(12) cm long, covered by leaf sheaths throughout, leafy in apical half, with few light gray roots near base. Leaves sessile with distinct articulation at the base; leaf blade rigid, lanceolate, distinctly conduplicate, keeled below, gradually tapering to shortly bifid apex, (6)8–12(14) cm long, (0.8)0.9–1.1(1.2) cm wide. Inflorescences placed opposite leaf base, lax raceme, (5)6–10(12) cm long; peduncle straight to arching, 2–4 cm long, sheathed at base; rachis straight to distinctly zig-zag, with sparse brownish scurfy hairs, (2)4–6(8) cm long; floral bracts narrowly triangular, acute, 2.5–3 mm long. Flowers (9)9.5–10.5(11) mm across; sepals and petals white with purple tint to pale pink, with unclear irregular purple marks; lip white, base and side-lobes purple. Pedicel and ovary green, hairy with brownish scurfy hairs, (7)8–10(11) mm long, 0.8–1 mm in diameter. Sepals and petals narrowly obovate to oblong narrowly obovate, blunt to obtuse, spreading, (5)6–7(8) mm long, 1.2–1.8 mm wide, lateral sepals shortly connate with lip base, petals little narrower. Lip obscurely 3-lobe, fleshy, narrowly obovoid, bailer-shaped in outline, (4)4.5–5.5(6) mm long, narrowing to the base, distally broadening, deeply saccate, at right angle to the ovary; side-lobes obliquely truncate, erect, with incurved front corner; median lobe minute, broadly triangular. Column foot-less, 1.4–1.6 mm tall, twisted, with large narrowly triangular oblique rostellum. Anther cap hemispheric, 0.6–0.7 mm in diameter. Fruits unknown. Ecology and phenology :—Epiphyte in lowland evergreen broad-leaved forests. Flowers in May–June. Distribution :— VIETNAM ( Dak Lak Province ). Bhutan, India (Assam, Meghalaya, Nagaland, Arunachal Pradesh, Sikkim, West Bengal). Conservation status :—Vietnamese population of this rare species is distant from its nearest location in NE India for about 2500 km , which considerably expands EOO. Meanwhile, the species was not ever reported on vast areas between newly discovered location in Vietnam and main species area in Bhutan and NE India . In this connection, it may represents isolated disjunctive refuge do not connected directly with main species area. According to available data, lone population in Vietnam has AOO surely less than 10 km 2 with the number of mature individuals less than 50. Being into consideration the extensive deforestation in the region of species location its conservation status should be preliminarily estimated as nationally Critically Endangered, CR (B1a,b(i-v); C2a(i); D). FIGURE 6. Micropera mannii (Hook.f.) Tang & F.T.Wang. A. Flowering plant. B. Inflorescences. C. Flowers, anther cap and pollinarium removed. D. Intact flower, half side view. Specimen L. Averyanov , N.V. Canh, T. Maisak, AL 1339 . Trichoglottis ramosa (Lindl.) Senghas. E. Flowering plant. F. Flattened plant. G. Intact flowers. H. Flower and flower buds. I. Intact flower frontal view. J. Flower with anther cap removed, frontal view. Specimen L. Averyanov , N.V. Canh, T. Maisak AL 1378. All photos made by L. Averyanov; correction and plate design by L. Averyanov and T. Maisak. Notes :—In comparison with plants from Bhutan and NE India , studied Vietnamese specimens have somewhat larger leaves, longer inflorescences, and distinctly larger flowers. Additionally, they are isolated geographically hence may represent separate allopatric variety. Studied specimens :— VIETNAM , herbarium specimen prepared in 29 May 2022 , L . Averyanov , N . V . Canh , T . Maisak , AL 1339 from cultivated, wild collected plants originated from Dak Lak Province , flowers pink, tepals with purple marks, lip base and side-lobes purple, column purple, anther pale yellow ( LE01168977 https://herbariumle. ru/?t=occ&id=142645 analytical photos LE01123411 https://en.herbariumle.ru/?t=occ&id=137201) .