Bulbophyllum hamatum Q. Yan, X.W. Li & J.Q. Wu, 2021

Yan, Qi, Li, Xin-Wei & Wu, Jin-Qing, 2021, Bulbophyllum hamatum (Orchidaceae), a new species from Hubei, central China, Phytotaxa 523 (3), pp. 269-272 : 269-271

publication ID	https://doi.org/ 10.11646/phytotaxa.523.3.9
DOI	https://doi.org/10.5281/zenodo.5659674
persistent identifier	https://treatment.plazi.org/id/5244B05E-FFC8-E20F-7BC3-2056C178F496
treatment provided by	Plazi
scientific name	Bulbophyllum hamatum Q. Yan, X.W. Li & J.Q. Wu
status	sp. nov.

Treatment

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

Type. CHINA. Hubei, Wufeng County, Wufeng Town, Shuitantou Village , epiphytic on tree or moss rocks in the subtropical evergreen broad-leaved forest, elev. 959 m, 30°6´16˝E, 110°39´6˝N, 21 April 2021, Q. Yan 4001 (holotype: HIB!) GoogleMaps

Description. Epiphytic or lithophytic herb. Rhizome creeping, 2 mm in diam., rooting from base of pseudobulbs. Pseudobulbs 1–7 cm apart on rhizome, narrowly pyriform to subcylindric, 1–2.5 cm, 0.3–1.2 cm in diam., with a terminal leaf. Petiole 1–2 cm; leaf oblong, 3–8.5 × 0.7–1.6 cm, thick, leathery, base cuneate, apex obtuse and retuse, mid-vine concave adaxialy, convex abaxialy. Scape arising from base of pseudobulb, erect, usually 5–9 cm; condensed raceme 2–4-flowered; peduncle slender, ca. 1 mm in diam., 2 or 3 tubular sheaths, placed sparsely; floral bracts ovate, cymbiform, 8–12 mm. Pedicel and ovary 1.2–2 cm, densely purple spotted. Flowers yellowish white. Dorsal sepal broadly ovate, 6–10 × 5 mm, apex long acuminate to caudate, margin entire, 4–5-veined; lateral sepals usually free, narrowly falcate-lanceolate, 16–22 × 5 mm, base adnate to column foot, margin entire, twisted near base and divergent, apex acuminate. Petals ovate or ovate-triangular, 5 × 4 mm, tip caudate with a thread 2–3 mm, margins finely erose to deeply lacerate distally, 3-veined; lip recurved, ligulate, ca. 6 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. 5 mm, with ovoid wings at upper part; foot curved, ca. 4mm, with free part ca. 3 mm; stelidia hooked or falcate, ca. 2 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, Hubei, China, on damp moss rocks and trees in the subtropical evergreen broad-leaved forest at the elevation 950–1200 m. Three subpopulations were found around the type 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 View TABLE 1 and Fig. 2 View FIGURE 2 .