Bulbophyllum minhquanii Vuong, Q. T. Truong & Aver. 2025, sp. nov.

2. Bulbophyllum minhquanii Vuong, Q.T.Truong & Aver. sp. nov. (Figs. 2 & 3) Type: — VIETNAM. Kon Tum Province: Sa Thay District, forest around Ialy Waterfall, 22 November 2024, Truong Ba Vuong, Nghiem Xuan Son, BV 1944 (holotype VNM 00074068!); Truong Ba Vuong, Nghiem Xuan Son, BV 1944 (paratype VNM 00074072!). Diagnosis: — Bulbophyllum minhquanii is similar to B. lilacinum in the color of flowers but differs in petals with a long seta at apex, the auricles at base of lip, two small calli at the base and short small keel in middle of the lip, and the large rectangular callus at lower margin of stigma. The new species also shares the swollen callus with B. morphologorum but differs in petals twice longer, keels on the adaxial surface of lip, and the auricles at the lip base. Description: —Epiphytic creeping herb. Pseudobulbs 1-leaved, green or dark green, ovoid, 5–6 cm tall, 4-angled, distant on creeping brown rhizome, covered by brownish bracts; rhizome woody, 3.5–4 mm in diameter. Leaves petiolate; petiole 1.5–2 cm long, leaf blade glossy, dark green above, green below, oblong to narrowly oblong, 22–23.5 cm long, 3–3.5 cm wide, acute. Inflorescence arising from the base of pseudobulbs, erect or distally arching; peduncle yellowish-green, glabrous, 6–9.3 cm long, 4–5 mm in diameter, at the base covered by 5 to 6 tubular overlapping brown to dark brown, acute or acuminate bracts 0.6–2 cm long, above with two spaced bracts; rachis yellowish-green, glabrous, 8.5–10 cm long, ca. 5 mm in diameter, densely many-flowered; floral bract brown, triangular, ca. 5 mm long, ca. 2 mm wide, acuminate; pedicel with ovary, yellowish-green, terete, ca. 4 mm long, pedicel glabrous, ovary slightly thicker, with six prominent keels, sparsely papillose, with nipple-like projections. Flowers with tepals pink to light pinkish, marked with numerous violet spots; lip yellowish-pink with violet dots. Median sepal obovate to broadly obovate, concave, 4.5–5 mm long, 2.6–3 mm wide, acute or shortly mucronate, abaxial side sparsely papillose. Lateral sepals broadly elliptic-ovate, slightly concave, 6–6.5 mm long, ca. 3 mm wide, acuminate, ca 1 mm long, slightly back-curved, abaxial side sparely papillose. Petals 1-veined, triangular to narrowly triangular, ca. 2 mm long, 1 mm wide, acute with filiform seta ca. 2 mm long, petals (excluding seta) as long as or slightly longer than the column. Lip narrowly triangular, fleshy, slightly downcurved, 4–4.2 mm long, 1.5–1.6 mm wide, margin down curved, surface glabrous, margin papillose ciliate, apex rounded, lip adnate to the apex of the column foot, with a small white appendage; base with triangular, falcate, auricles, ca. 0.5 mm long, apex acute pointing forward, margin slightly erose; lip base with 2 small calli; adaxial side with two prominent keels coming from base of auricles to near apex, lip at base forming canal with short small keel; abaxial side with longitudinal groove coming from the base to near apex. Column ca. 2 mm long (without stelidia); column foot forward directed, at apex upcurved, ca. 3 mm long, apex emarginate; stelidia, ca. 2 mm long, triangular-subulate, slightly downcurved, with entire margin; stigma obscurely rectangular to broadly obovate, ca. 1 mm long and wide, lower margin with swollen rectangular callus, ca. 1.5 mm long, 0.5 mm thick; anther cap yellow, conoid, ca. 1 mm long; pollinia 4 in 2 pairs, inner smaller than outer. Fruits not seen. Etymology: —The species is named after Assoc. Prof. Dang Minh Quan (Can Tho University) in recognition of his immense knowledge and contributions to the teaching in plant taxonomy. Habitat and phenology: —Creeping epiphyte on large trees in humid and dry forests. Flowers in November. Distribution: —The species is known from one location in Kon Tum Province, southern Vietnam. Note: —The new species is similar to B. lilacinum in its light pinkish flowers and to B. morphologorum in having a callus below the stigma. The detailed morphological differences of mentioned species are presented in Table 1. Data for Bulbophyllum morphologorum are based on data reported by Kraenzlin (1908: 89), Stapf (1924 tab. 9033), and Seidenfaden (1979: 136); for B. lilacinum are based on data from Ridley (1896: 276), Ridley (1917 tab. 8723), and Seidenfaden (1979: 140).