Species Information - Dendrobium arachnoideum

Dendrobium arachnoideum Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 469; 21 (1923) t. 157.

Type: Schlechter 19653 (holo B, lost).

Synonyms:

• Diplocaulobium arachnoideum (Schltr.) Carr, Bull. Misc. Inform. Kew (1934) 381.

Rhizome very short, roots elongated, filiform, flexuose, glabrous. Pseudobulbs crowded, 1-leaved, slender, to the base obclavate-swollen, 7.5-9.5 by 0.6-1 (at the base) to 0.15-0.2 cm (near the apex). Leaves linear, 8.5-11.5 by 0.4-0.5 cm, apex obtuse, unequally bilobulate, subcoriaceous. Inflorescences arising in succession from the apex of the pseudobulb, 1-flowered, spathe laterally compressed, c. 1.5 cm long, subacute. Floral bract deltoid, minute. Pedicel and ovary 3.5-4 cm long, slender, glabrous. Flower resupinated, c. 9 cm wide. Dorsal sepal lanceolate, narrowing to the elongated apex, 5 cm long. Lateral sepals obliquely lanceolate, narrowing to the elongated apex, widened to the base, 5 cm long; mentum c. 0.6 cm long, obtuse. Petals obliquely narrowly lanceolate, narrowing to the elongated apex, c. 4.8 cm long. Lip weakly 3-lobed in the middle, subpandurate in outline, 1.3 by 0.4 cm, with two parallel keels extending from the base to the middle, in front of the keels with an oblong farinose-puberulous callus; lateral lobes hardly developed, broadly obtuse; midlobe ligulate, at the base slightly narrowed and with somewhat undulate margins, obtuse. Column short, clinandrium 3-lobulate, the median lobule acute, triangular, the laterals shorter, truncate; column-foot c. 0.6 cm long. Anther subreniform-cucullate, glabrous, in front truncate.
(after Schlechter, 1912).

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