Prev Taxon: Genus Bulbophyllum section Piestobulbon
Current Genus: Genus Bulbophyllum section Polymeres
Next Taxon: Genus Bulbophyllum section Schistopetalum
Bulbophyllum subium
Bulbophyllum subium J.J.Verm., Schuit. & de Vogel, Lankesteriana 20(3) (2020) 315, fig. 9
Type: Johns 9057 (holo K, iso BO, L, MAN, FREE).
Synonyms:
Small epiphyte. Roots spreading. Rhizome creeping, c. 0.25 cm diam., new shoot from the basal node of the pseudobulb; rhizome scales thin, withering soon. Pseudobulbs distinct, 0.3–0.5 cm apart, ellipsoid, 1.0–1.2 by 0.3–0.4 cm, hardly angular but concave on the side where the new shoot arises. Leaf: petiole 0.05–0.15 cm long; blade elliptic to obovate, 2.9–6.0 by 0.5–0.7 cm, index 4.1–12; apex subacute. Inflorescences single or several together, c. 8 cm long, 1-flowered; peduncle c. 4.5 cm long; scales c. 4; floral bracts c. 0.4 cm long. Flowers: pedicel and ovary c. 0.9 cm long; basal node c. 0.2 cm above the floral bract attachment. Median sepal free, recurved, ovate, c. 2.2 by 0.32 cm, index 6.8–6.9; margins entire, ciliolate; apex long-acuminate; surface glabrous; 3-nerved. Lateral sepals free, recurved, ovate-triangular, c. 2.85 by 0.3 cm, index c. 9.5. Petals porrect, elliptic to ovate, 0.31–0.45 by 0.1–0.11 cm, index 2.8–4.5; margins minutely erose and/or ciliolate; apex acute; surface glabrous; 1-nerved. Lip slightly recurved near base, elliptic to oblong, thick, 0.46–0.5 by 0.13–0.18 cm, index 2.5–3.9 (without spreading); margins entire, about densely hirsute near the base, glabrous in the top half; apex rounded; upper side concave close to the base, this cavity with a near the base widening, glabrous median crest which continues up to 1/3–2/5 of the length of the lip, the cavity bordered by two short, converging ridges with a densely papillose crest, upper surface otherwise slightly concave and with two densely hirsute patches towards the margins in the basal 1/3–2/5 of its length, slightly convex and slightly papillose elsewhere; underside convex and shortly hirsute with scattered glandular papillae near the base, slightly concave and glabrous elsewhere. Column including stelidia 0.09–0.12 cm long; column foot deeply furrowed, in the top part distinctly widened, with spreading, obtuse lateral teeth; stigma elliptic, near the base distinctly protruding from the column face; stelidia upwards falcate, triangular, 0.03–0.04 cm long, acute; pollinia 4.
(after Vermeulen et al., 2020)
Flowers dark red-purple.
Epiphyte in Casuarina forest. Elevation 2500 m.
Malesia (New Guinea).
Indonesia (Papua Province, Mimika Regency), see map
Cool growing epiphyte.
October.
- Family Orchidaceae
- Subfamily Epidendroideae
- Tribe Dendrobieae
- Subtribe Bulbophyllinae
- Genus Bulbophyllum
- Section Polymeres
- Species Bulbophyllum subium
Bulbophyllum subium J.J.Verm., Schuit. & de Vogel belongs in series B.
Bulbophyllum subium J.J.Verm., Schuit. & de Vogel shares the clustered growth combined with narrow sepals and short, upwards falcate stelidia with Bulbophyllum galliaheneum Van Royen and with B. odontopetalum Schltr.
Bulbophyllum subium differs from B. galliaheneum in the elliptic to ovate, acute petals (versus petals obovate-oblong, subtruncate to rounded), in the much denser and larger hirsute patches near the base on the upper side of the lip, and in the triangular stelidia (versus stelidia narrowly triangular and in the top part subulate).
Bulbophyllum subium differs from B. odontopetalum Schltr., in the elliptic to ovate, minutely erose and/or ciliolate petals (versus petals obovate-spathulate, coarsely fimbriate), and by the hirsute lip margins (versus lip margins glandular-papillose).
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Bulbophyllum subium
Bulbophyllum subium J.J.Verm., Schuit. & de Vogel, drawing © J.J. Vermeulen, in J.J.Verm., Schuit. & de Vogel, Lankesteriana 20 (2020) 315, fig. 9, from Johns 9057 (herbarium)