Bulbophyllum hamatum Q. Yan, X.W. Li & J.Q. Wu , sp . nov . (Ḃǘ卷瓣兰; Fig. 1 )

Diagnosis . Bulbophyllum hamatum resembles B. omerandrum in free lateral sepals, petals bearing fimbriate-ciliate margin, and fleshy recurved ligulate lip, but differs in hooked or falcate stelidia, caudate dorsal sepal and petals, and ovoid column wings.

FIGURE 1. Bulbophyllum hamatum . A : Habitat; B : Individuals of a subpopulation; C : Flowering plant; D-E : Leaves and pseudobulbs; F : Flower, front view; G : Flower, ventral view; H : Lateral sepal, lip and column, side view; I : Anatomy of the flower; J : Petal, lip and column, front view; K : lip and column, side view; L : Lip, side view; M : Lip, ventral view; N : Column, ventral view; O : Anther cap; P : Pollinia.

Type .

Key Value
id 6A850B15FFCAE20F7A4D27F9C2F9F7C2
ID-GBIF-Occurrence 3392775301
collectingDate 2021-04-21
collectionCode HIB
collectorName Q. Yan
country China
county Wufeng County
elevation 959
latitude 30.104445
location Shuitantou Village
longitude 110.651665
municipality Wufeng Town
specimenCount 1
stateProvince Hubei
typeStatus holotype
collectingCountryCHINA . collectingRegionHubei , collectingCountyWufeng County , collectingMunicipalityWufeng Town , locationShuitantou Village , epiphytic on tree or moss rocks in the subtropical evergreen broad-leaved forest, elev. quantity 959 m , 30°6´16˝E, 110°39´6˝N, date 21 April 2021 , collectorName Q . Yan 4001 ( typeStatusholotype : collectionCodeHIB !)

Description . Epiphytic or lithophytic herb. Rhizome creeping, quantity2 mm in diam., rooting from base of pseudobulbs. Pseudobulbs quantity1–7 cm apart on rhizome, narrowly pyriform to subcylindric, quantity1–2.5 cm , quantity0.3–1.2 cm in diam., with a terminal leaf. Petiole quantity1–2 cm ; leaf oblong, 3–8.5 × quantity0.7–1.6 cm , thick, leathery, base cuneate, apex obtuse and retuse, mid-vine concave adaxialy, convex abaxialy. Scape arising from base of pseudobulb, erect, usually quantity5–9 cm ; condensed raceme 2–4-flowered; peduncle slender, ca. quantity1 mm in diam., 2 or 3 tubular sheaths, placed sparsely; floral bracts ovate, cymbiform, quantity8–12 mm . Pedicel and ovary quantity1.2–2 cm , densely purple spotted. Flowers yellowish white. Dorsal sepal broadly ovate, 6–10 × quantity5 mm , apex long acuminate to caudate, margin entire, 4–5-veined; lateral sepals usually free, narrowly falcate-lanceolate, 16–22 × quantity5 mm , base adnate to column foot, margin entire, twisted near base and divergent, apex acuminate. Petals ovate or ovate-triangular, 5 × quantity4 mm , tip caudate with a thread quantity2–3 mm , margins finely erose to deeply lacerate distally, 3-veined; lip recurved, ligulate, ca. quantity6 mm , fleshy, base attached to end of column foot by a mobile joint, apex obtuse and apiculate, sparsely finely papillate on both sides. Column ca. quantity5 mm , with ovoid wings at upper part; foot curved, ca. quantity4mm , with free part ca. quantity3 mm ; stelidia hooked or falcate, ca. quantity2 mm ; anther cap comblike on apical margin; pollinia 4, in 2 pairs.

Etymology . The specific epithet “ hamatum ” refers to the hooked or falcate stelidia in this new species.

Phenology . Flowering in April to May, fruiting in May.

Distribution and habitat . B. hamatum grows in Wufeng County, collectingRegionHubei , collectingCountryChina , on damp moss rocks and trees in the subtropical evergreen broad-leaved forest at the elevation quantity950–1200 m . Three subpopulations were found around the typeStatustype locality.

Taxonomic note : B. hamatum mainly differs from B. omerandrum in hooked or falcate stelidia. The morphological differences between them were summarized in Table 1 and Fig. 2 .