Prev Taxon: Genus Agrostophyllum
Current Genus: Genus Agrostophyllum section Agrostophyllum
Next Taxon: Genus Agrostophyllum section Appendiculopsis
Prev Species: Agrostophyllum grandiflorum
Next Species: AgrostophylIum grubbianum subsp. kaironkense
Agrostophyllum grubbianum Ormerod, Orchadian 16 (2010) 322, fig.
Type: Grubb & Edwards 18 (holo A; iso K, L, LAE).
Synonyms:
Rhizome covered by chaffy sheaths, 0.1 cm thick roots growing back along its length and stem remnants, presumably erect or apically curved from a decumbent base, to 15 cm long. Stems erect, in tufts of 3-5 near the rhizome apex, laxly 3-7 leaved, 17-20 by 0.30-0.55 cm across leaf sheaths. Leaves obliquely erect, ligulate 4-5.1 by 3.8-4.5 cm; leaf sheaths complanat with scarious margins, finely striate, to 3.6 by 0.3-0.4 cm; leaf sheayh on both sides with a subulate stipule to 0.25 cm long; apex acutely bidentate, sinus to 0.15 cm deep, with short apiculus. Capitulum terminal, 1-flowered. Peduncle very short. Bracteole or peduncular sheath chaffy, c. 1.05 cm long. Floral bracts lanceolate, acute, c. 0.06 cm long. Pedicel and ovary glabrous, 1.5 cm long. Dorsal sepal ovate-lanceolate, 1.1 by 0.4 cm; apex acute; 7-nerved. Lateral sepals obliquely ovate-lanceolate, 1.3 by 0.45 cm; apex acute. Petals oblong-oblanceolate, 1.1 by 0.3 cm; margins laxly undulate; apex acute; 5-nerved. Labellum 3-lobed, 1.2 cm long; hypochile with erect sides, 0.35 by 0.3 cm, inside with a low hump-shaped 3-ridged callus; transverse lamella between hypochile and epichile erect, rectangular, shallowly dentate, finely pubescent; epichile c. quadrangular, 0.79 by 0.95 cm; basal half with 2 low thickenings; apex broadly acute. Column semiterete-subclavate, hooded, c. 0.48 cm long; lateral margins with about halfway a small obtuse projection.
(after Ormerod, 2010)
Leaves with dark green sheaths with sometimes blackened scarious margins. Flowers white with a yellow patch on centre of lip.
Montane forest. Altitude 2530-2600 m asl.
Malesia (New Guinea, endemic).
Papua New Guinea, Eastern Highlands Province; see map.
Cool growing epiphyte.
November.
Agrostophyllum grubbianum is closely related to A. cyatheicola Schuit. & de Vogel, it may be distinguished by its longer stems (17-20 vs. 4-10.5 cm) that are more compressed (or flatter) and more laxly leaved. The apices of the leaf sheaths have on each side a slender (not short and triangular) stipule and the flowers have an entire, broadly rhombic labellum (not trilobulate).
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