Genus Bulbophyllum section Brachypus
Bulbophyllum sect. Brachypus Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1: 700, 765. Type species: Bulbophyllum maxillarioides Schltr. (designated by Van Royen, 1979)
- Genus Bulbophyllum Section Gibberanthera J.J.Sm., Nova Guinea 12 (1916) 424
Small to medium-sized epiphytes. Roots sprouting mainly below the pseudobulbs, glabrous or slightly and minutely hirsute locally. Rhizomes (rather) short-creeping; rhizome scales thin, approx. glabrous to minutely colliculate, caducous (with the nerves slightly more persistent). Pseudobulbs conspicuous compared to the size of the plant, 1-leafed, with shoots sprouting at its basal node and free, or fused to the pseudobulb over a very short distance only. Leaves persistent, thick, nerves inconspicuous. Inflorescences sprouting at or somewhat above nodes along the length of the rhizome, usually densely fasciculate, 1-flowered; peduncle shorter than to approx. as long as the pseudobulbs (approx. as long as the leaves in Bulbophyllum ialibuense); peduncle scales 24, scattered along the peduncle; floral bracts tubular. Flowers per sympodium 1 open at a time. Pedicel with the basal node well above the attachment of the floral bract, approx. as long as the ovary or longer. Sepals free, or the laterals (partly) connate, or all three (partly) connate. Lateral sepals not or hardly longer than the median (up to 1.2 times as long as the median in Bulbophyllum ialibuense), elliptic to ovate-triangular, 85.2 cm long, glabrous (minutely papillose-ciliolate in Bulbophyllum phaeoglossum), thin to thick; margins entire; apex obtuse to short-acuminate; 3-9-nerved, surface glabrous or (finely) papillose to hirsute adaxially. Petals fused to the column over a short distance near the base, either over their entire width, or along the upper margin only (free in the group of Bulbophyllum lineolatum, see below), rhombiform, oblong, or elliptic to triangular, 3.8 cm long, glabrous to papillose to ciliolate; thin; margins approx. entire; apex truncate to acute; 1-nerved; glabrous (adaxial surface finely papillose in Bulbophyllum calceilabium). Lip mobile on a thin ligament, without auricles near the ligament, undivided, elliptic to (ob-) ovate, oblong, or hastate, 0.258 cm long, glabrous to papillose or ciliolate; margins approx. entire; adaxially without ridges, or with two (more or less converging) ridges in approx. flexural position; surface approx. glabrous to papillose; abaxial surface glabrous, or with a distinct, finely to coarsely papillose or hirsute patch in the middle part (often combined with an approx. glabrous adaxial side). Column with rostellum front receding in between the stelidia; stigma slit-like to wide, rounded, without keels inside, usually not protruding proximally (protruding in Bulbophyllum ialibuense and in some of the group of Bulbophyllum lineolatum); column foot not or hardly widening nor thickening towards its top, free part short, without lateral teeth at the tip (with small, patent lateral teeth in Bulbophyllum variculosum, Bulbophyllum wollastonii); stelidia shorter to distinctly longer than 1/2 of the length of the column; distinct, triangular to subulate, or narrowly oblong, with or without a patent to antrorse deltoid, obtuse tooth along the upper margin, with at most a slight, rounded widening present along the lower (with a deltoid, obtuse wing in Bulbophyllum variculosum); anther with a high rounded crest, in front not concave, front margin not drawn out; pollinia 4, with the inner ones more than half as long as the outer ones, without appendages.
Colours: Flowers usually white or yellowish or greenish, with or without purple markings, or flowers largely purple; lip bright yellow in some species. .