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12. Epigeneium pulchellum Ridl. Summerh. Plate 10
Sarcopodium pulchellum Ridl., Journ. Fed. Malay States Mus. 8 1917 93. Dendrobium brevibulbum J.J. Sm., Bull. Jard.Bot.Buitenz. 3 1928 62.
Katherinea pulchella Ridl. A.D. Hawkes, Lloydia, 19 1956 97. Epigeneium pulchellum Ridl. Summerh. comb.nov., Kew Bull. 1957 264;
Comber, Orchid of Sumatra 2001 675.
Rhizom e long, creeping c. 2.5-3.5 mm in thickness, covered by c.10
layered cataphylls, partially persistent, triangular, and acute. Root mostly found
on the lower part of the pseudobulbs along the rhizome, fibrous, branches.
Pseudobulb small, globose to ovoid, sometimes longest, c. 0.6-2 x 0.35-0.9 cm,
placed 0.3 4.5 cm apart on the rhizome. Leaves 2 on each top of pseudobulb,
narrower ovate to elliptic, c. 1 - 4.2 x 0.6 – 1.3 cm, apex shallowly lobed, unequal,
obtuse, petiole 2-5.5 mm. Inflorescence short, peduncle and rachis c. 1 cm, with 1-2 flower. Flower white, quite large in proportion to the plant size, 3 x 2.7 cm;
dorsal sepal 1.55 cm x 6 mm, elliptic, acute; lateral sepal 1.4 cm x 7.5 mm,
elliptic but wider at base, acute; petal 1.5 cm x 6 mm, elliptic, acute; labellum
trilobed, 1.3x1.25 cm, side lobes erect, mid-lobe with three longitudinal keels, the
middle ones thinner and elongate to the base, the mid-lobe ovate, obtuse; column
9 mm, column foot 4 mm, with short wings.
Distribution : Tanah Gayo Aceh, Mt. Kerinci Jambi.
Habitat : Mountain forest, in mount Kerinci it was collected from 1,900 m asl.
Some herbarium specimen were collected from Aceh and North Sumatra from above 2,000 m asl. Flowering time: January, February, August, and December.
Note : So far Epigeneium pulchellum is the smallest Epigeneium found in Sumatra.
In absent of flower, this species can be distinguished from other species is from its small size. Another difference is, it has only single flower on each inflorescence.
At a glance E. pulchellum seem to be similar with E. longirepens but the last one only has single leaf on each pseudobulb and distribution area is restricted to
Borneo Endemic, meanwhile E. pulchellum endemic to Sumatra.
Specimen examined: Aceh, Gajolanden 2,300-2,700 m asl, January 1937,
C.G.G.J. van Steenis 8344 BO; Gajolanden 2,500-3,000 m asl, C.G.G.J. van Steenis 9026 BO; Gajolanden 3,300-3,500 m asl, C.G.G.J. van Steenis 8582
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BO; Mt. Leuser 3,200-3,400 m asl, W.J.J.O de Wilde and B.E.E. de Wilde- Duyfjes 16563 BO.
13. Epigeneium quinquecallosum J.J. Sm. Summerh.
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