Dendrobium fallacinum
Dendrobium fallacinum Ormerod, Malesian Orchid J. 4 (2009) 49, fig. 1.
Type: L.J. Brass 8924 (holo AMES).
Synonyms:
- Dendrobium poneroides Schltr. var. angustum Schltr., Repert. Spec. Nov. Regni Veg., Beih. 1: 629 (1912).
- Type: Schlechter 16688 (holo B, lost, iso AMES, K, NSW; BO, E, G, L, MO). - Dendrobium poneroides auct., non Schltr., Repert. Spec. Nov. Regni Veg., Beih. 1: 628 (1912); loc. cit., Beih. 21: t. 211,fig. 797 (1928).
Epiphytic herb. Roots 0.05—0.2 cm thick, terete, fleshy. Stems caespitose, erect, straight to weakly fractiflex, laxly to densely leafy, 5—40 by 0.1 cm; internodes terete, 0.3—1 cm long. Leaves linear to ligulate-lanceolate,
1.2—4 by 0.2—0.25 cm, striate, occasionally minutely transversely rugulose on upper part; sheaths tubular, 0.3—1 cm long; apex unequally bilobed with subacute to obtuse tips. Inflorescence 1- flowered, peduncle very short. Flowers not resupinate. Pedicel and ovary clavate, 0.22 cm long. Median sepal ovate, 0.32—0.4 by 0.18—0.21 cm; apex acute to subacute; 3- nerved. Lateral sepals obliquely broadly ovate-deltate, 0.4—0.5 by 0.4—0.5 cm; apex subacute to acute; 5-nerved; mentum 0.4 cm long. Petals ligulate, 0.4 by 0.09 cm; apex acute; 3-nerved. Lip trilobed, to 0.58 by 0.28-0.4 cm, thinly fleshy, 5-nerved; hypochile cuneate to obovate, 0.33—0.4 by 0.28—0.4 cm, its lateral lobes usually apically thickened, sometimes not, with an oblong to rectangular callus in basal c. 1 mm of lip; epichile subquadrate, elliptic to suborbicular, 0.17—0.175 by 0.13—0.2 cm, with rounded to subtruncate apex and thickened margin. Column stout, semi-terete, 0.1—0.12 cm long; column foot c. 0.35—0.385 cm long.
(after Ormerod 2009)
Sepals and petals yellow, yellowish green to pale green, lip reddish, brown to purple-brown, especially tips of side lobes, mid-lobe yellowish.
Mangrove and hill forest. Altitude: sea level—500 m.
Malesia (New Guinea)
Papua New Guinea (Morobe, Oro and Milne Bay Provinces) Province
Warm to intermediate growing epiphyte.
January, April, June, September and November
- Family Orchidaceae
- Subfamily Epidendroideae
- Tribe Dendrobieae
- Subtribe Dendrobiinae
- Genus Dendrobium
- Section Biloba
- Dendrobium fallacinum
Dendrobium fallacinum differs from Dendrobium poneroides in the hypochile being 2.8—4 mm wide and the subovate-orbicular epichile 3.3 mm wide with only the margins thickened (versus hypochile 3.5 mm wide and epichile fleshy, subovate-orbicular, 3.3 mm wide).
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Dendrobium fallacinum
Dendrobium fallacinum Ormerod. Drawing by Paul Ormerod in Malesian Orchid J. 4 (2009) 49, fig. 1, based on L.J. Brass 8924.