Epigeneium quinquecallosum J.J. Sm. Summerh.

33 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.

Dendrobium quinquecallosum J.J. Sm., Bull. Jard. Bot. Buitenz. 3 1920 68. Epigeneium quinquecallosum J.J. Sm. Summerh. comb. nov., Kew Bull. 1957 264; Comber, Orchid of Sumatra 2001 674. Rhizome creeping, branching, 3.2-4.4 mm in thickness, covered by c. 5 layered cataphylls, imbricate, elliptic, and acute. Root terete, fibrous, branching. Pseudobulb ovoid, 1-6-1.84 x 0.8 cm, with deep groove on the side, angular, placed 2.8-3.2 apart on rhizome. Leaves two on each pseudobulb, elliptic, 3-6- 3.92 x 1.56-1.84 cm obtuse, shallowly obliquely bilobe, with 4 second major vein, coriaceous. Inflorescence between two leaves on top of pseudobulb, peduncle. 5.68 with 2 sterile bracts, tubular, acute, rachis c. 3.04 cm, bring about 4 flowers. Flower white, dorsal sepal lanceolate, narrowly obtuse, apiculate, 2.75 x 0.77 cm; lateral sepal obliquely, lanceolate, acute, 2.8 x 8 cm; petal obliquely lanceolate, acute 2.9 x 0.65 cm; labellum trilobe, curved, 1.7 cm long, with four small calli near the base and five larger one placed between the side lobe just below the mid-lobe, the middle one of this five is longer, side lobes erect, reaching over the column, concave, triangular obtuse, the mid-lobe recurved in the middle, ovate and acuminate with seven wavy nerves, 8.5 x 0.7 cm; column slightly curved, concave below, 9 mm long. Habitat : mountain forest at around 1,700 m asl, flowering on November. Distribution : Laras Talang West Sumatra, Mt. Dempo South Sumatra. Note: five calli between the side lobes is the key character to distinguish this species from others within this genus. It is only represented by single photo of the specimen deposit in BO. The specimen also keeps in Leiden but the image is unavailable. Flower description base on publication Smith 1920. Specimen examined: Sumatra, Laras Talang 1,750 m asl, November 11, 1918, H.A.B. Bunnemeijer 5437 BO. 34

14. Epigeneium sikijangensis Destri sp. nov. Plate 11-12