Bulbophyllum pseudohydra (Summerh.) J.M.H.Shaw, Orchid Rev. 124(1314, Suppl.): 35 (2016).
Homotypic Names:
Chaseella pseudohydra Summerh., Kirkia 1: 89 (1961).
Plant creeping, epiphytic. Roots 0.4-0.6 mm diam. Rhizome 0.7-1.1 mm diam., nodes slightly swollen. Rhizome scales tubular, tip acuminate, the lower obtuse to acute; membranous, with many nerves; slightly keeled abaxially towards the tip. Pseudobulbs 6-12-leafed, orbicular to ovoid, 0.3-2.2 cm apart, 0.4-0.8 by 0.3-0.7 cm, not or hardly flattened, obtusely 4-8-angled. Petiole at most 0.4 mm long. Leaf blade lanceolate to linear-lanceolate, 0.2-0.9 by 0.05-0.1 cm, tip obtuse to acute, neither emarginate nor oblique; coriaceous; very thick (orbicular to semi-orbicular in section); midrib not prominent abaxially. Inflorescence c. 2.2 cm long, 1 (- ?2)-flowered. Peduncle about patent, wiry, c. 1.9 cm by c. 0.6 mm, orbicular in section, slightly flattened and with 2 opposite, slightly denticulate ridges towards the tip, with some fine dark hairs, with c. 4 scales. Peduncle scales tubular, the longest c. 3 mm long; tip acute to acuminate; membranous, without nerves; keeled towards the tip and with some fine dark hairs abaxially. Rhachis erect or slightly nodding, terete, 0.3-0.4 cm long, with some fine dark hairs. Floral bracts recurved, elliptic, c. 3 by 2.5 mm, tip acute to acuminate; base rather narrowly attached; membranous; without nerves; keeled towards the tip and with some fine dark hairs abaxially. Flowers recurved, not fully open. Pedicel and ovary c. 3 mm long, with some fine dark hairs. Median sepal not recurved, ovate, c. 4 by 3 mm, tip subacute; margins entire, glabrous; base rather broadly attached; rather thin; glabrous adaxially; slightly keeled and with some fine dark hairs abaxially. Lateral sepals free, recurved, not falcate, about deltoid, oblique, c. 4 by 3.7 mm, keeled abaxially; otherwise as the median sepal. Petals not recurved, not falcate, elliptic, oblique, c. 1.8 by 1.2 mm, tip rounded; margins entire, glabrous; base rather broadly attached; thin; glabrous; not keeled abaxially. Lip recurved halfway, broadly ovate in outline (not spread), c. 1.8 by 1.2 mm, tip obtuse; margins entire, glabrous; thick; adaxially without ridges, with a slightly concave basal part, without a median slit, surface glabrous; abaxially with a weak, rounded ridge near the base, surface glabrous. Column from the base of the free part up to the tip of the stelidia c. 1.8 mm long, with distinct, triangular, not falcate, truncate to slightly bifid stelidia of c. 1 mm long; column with rather weak, rounded, finely serrulate teeth along its adaxial margins just below the base of the stelidia; stigma without a basal callus. Anther c. 0.8 by 0.7 mm; front not drawn out; front margin rounded, entire, papillose; basally distinctly emarginate; abaxially with a rather weak, rounded, colliculate ridge near the top of the anther which overtops the front margin, surface glabrous but late towards the top. Pollinia 2, triangular, distinctly flattened on one side, a ¡not been observed. Fruit not seen.
Flowers greenish.
Montane forest, altitude not given.
Kenya, E. Zambia
Encyclopedia of Cultivated Orchids Hawkes 1965; Flora of Tropical East Africa Orchidaceae Part 2 Cribb 1984; Orchid Monographs Vol 2 - A Taxonomic Revision of the Continental African Bulbophyllinae Vermeullen 1987; Flora Zambesiaca Vol 11 Orchidaceae Part 1 Pope 1995; Orchids of Kenya Stewart 1996; African Orchids in The Wild and Cultivation La Croix 1997; Bulbophyllum and Their Allies Seigerist 2001; Genera Orchidacearum Vol 6 Epidendroideae Pt 3 Pridgeon, Cribb Chase & Ramussen 2014
Click on each image to see a larger version.

Habitat/In situ 
chaseella pseudohydra 
Wursten. Image used
with kind permission.