Prev Taxon: Genus Dendrobium section Pleianthe
Current Genus: Genus Dendrobium section Rhizobium
Next Taxon: Genus Dendrobium section Spatulata
Dendrobium fuliginosum (M.A.Clem. & D.L.Jones) P.F.Hunt, Orchid Rev. 106 (1998) 62.
Type: Sydney cult., 23 Sept. 1995 (Clements 8540) (holo CANB; iso CANB, NCBG Port Moresby)
Synonyms:
Pendulous epiphytic herb forming sparse clumps to about 50 cm long. Aerial roots absent. Stems straight, 3-10 cm by 1-2 mm. Leaves linear-terete, 10-20 cm by 3-4 mm, pendulous. Racemes 3-5 cm long, wiry, arising singly from nodes at the leaf base, bearing 3-6 flowers. Pedicel 5-8 mm long, filiform. Ovary 1-2 mm long, hardly developed at anthesis. Flowers about 2 cm across, not opening widely, with a musty fragrance. Dorsal sepal linear oblong-elliptic, 18-20 mm by 4.5-5.5 mm, narrowed to the base, obliquely erect; margins incurved distally. Lateral sepals asymmetrically linear-oblong, 1.7-1.9 cm by 4.5-5.5 mm, falcate, divergent, margins incurved distally; apex subacute. Petals broadly elliptical-oblong, 1.8-2 cm by 6-7 mm, incurved over the column and lip; margins slightly irregular; apex subacute. Lip with a strong right-angled bend near the base, bringing the lateral lobes into close proximity with the column, then porrect, 1.5-1.7 cm by 6-7 mm when flattened; lateral lobes more or less semicircular, 3-4 by c. 1.5 mm, incurved; midlobe elliptic, 1.2-1.3 cm by 6-7 mm, thin-textured, with margins strongly sinuate, and apex subacute to subacuminate; callus of three narrow ridges, irregularly sinuate in the distal half, extending as faint lines nearly to the apex. Column 1.5-2.5 by 1.5-1.8 mm, porrect from the end of the ovary, glabrous; column foot 4-5 by c. 1 mm, at about 90 degrees to the column, shallowly channelled, glabrous. Stigma c. 1.8 by 1.5 mm, deeply sunken. Anther c. 2 by 2 mm, with a short, decurved, lacerate rostrum. Pollinia clavate, falcate, c. 1 mm long, waxy. Fruit not seen.
(after Clements & Jones, 1996).
Leaves dark green. Flowers dark purplish-black to sooty black, with some faint light mottling towards the apices of the tepals. Pollinia orange.
Epiphyte on Casuarina trees in open montane swampland. Altitude not recorded, but certainly above 1200 m, judging from the type locality
New Guinea (endemic).
Intermediate growing epiphyte.
Not known. Flowers of cultivated specimens last 5 to 10 days.
Dendrobium fuliginosum (M.A.Clem. & D.L.Jones) P.F.Hunt is easily distinguished by the dark purplish-black to sooty black flowers.
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