Bulbophyllum reclusum Seidenfaden (1995a: 47)

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 : 16

Bulbophyllum reclusum Seidenfaden (1995a: 47) , Newman et al. (2007: 256), Gale et al. (2018: 77).

( Fig. 2F–I )

Type: — THAILAND. Sakon Nakhon Province: Phu Phan National Park, Kham Hom waterfalls, Thaitong 1427 (holotype C).

Habitat and phenology in Vietnam: —Creeping epiphyte. Lowland evergreen broad-leaved forests. Rare. Flowers in November–December.

Distribution: — Vietnam: provinces Dak Lak (sine loc.) and Lam Dong (Bao Loc District). Myanmar?, Thailand, Laos.

Conservation status in Vietnam: — Bulbophyllum reclusum is known to be represented in the country by two or three localities. The available data on its Vietnamese populations are very scarce, and comprehensive field investigations are required. Accordingly, we estimate the national conservation status of the species as Data Deficient (DD).

Notes: — Bulbophyllum reclusum is reported here as a new record for the flora of Vietnam. The morphological traits of the Vietnamese plants studied here almost perfectly match those shown in the comprehensive description and photos included in the species protologue ( Seidenfaden 1995a). Prior to our study, this species was known only from its locus classicus in NE Thailand near the border with Laos, and from two published records from Laos without indications of geographical location ( Newman et al. 2007, Gale et al. 2018). The discovery of this species in southern Vietnam essentially expands its known distribution area in the southeast direction. Records of B. reclusum from Myanmar (cited by Tanaka et al. 2011, 2015, Aung et al. 2020) up to now remain doubtful (see Schuiteman et al. 2008, Ormerod et al. 2021).

Studied specimens:— VIETNAM. Dak Lak Province: wild collected plant originated from Dak Lak Province, cultivated by Huynh Duc Thach in Dak Lak Province, Buon Ho Town, herbarium and photos made on 20 November 2023, L. Averyanov, Nguyen Van Canh, T. Maisak, AL2721 (LE LE01253781 https://en.herbariumle.ru/?t=occ&id=211980, photos LE LE01124694 https://en.herbariumle.ru/?t=occ&id=208209). VIETNAM. Lam Dong Province: sine loc., creeping epiphyte, 20 December 2021, Truong Ba Vuong, Ngo Quang Dang, BV1495 (LE LE01169332 https:// en.herbariumle.ru/?t=occ&id=141206). VIETNAM. Lam Dong Province: plant collected in Lam Dong Province, Bao Loc District in November 2022 by Loc Bao Sang, cultivated in garden of Loc Bao Sang in Lam Dong Province, Di Linh Town, herbarium and photos made on 2 December 2022, L. Averyanov, N.V. Canh, T.B. Vuong, T. Maisak, AL1904 (LE LE01170003 https://en.herbariumle.ru/?t=occ&id=161984, photos LE LE01123719 https://en.herbariumle.ru/?t=occ&id=156627).

Figures

FIGURE 2. A. Listera anthropophora. Photos by L.Averyanov from living plant prior to the preparation of the type herbarium specimen Nguyen Van Canh et al., AL2439. B–E. Bulbophyllum conchiferum. Photos by L. Averyanov from the specimen L. Averyanov, Nguyen Van Canh, AL2080. F–I. Bulbophyllum reclusum. Photos by L. Averyanov from the specimens L. Averyanov et al., AL1904 (F, G) and AL2721 (H, I). Photo correction and design by L. Averyanov.