Bulbophyllum lyriforme J.J.Verm. & P.O'Byrne 2003

SECTION Sestochilos [Breda] Benth & Hook.f. 1883

Penyebaran: Kalimantan dan Papua New Guinea.

Ecology: Tumbuh pada cabang pohon di hutan rawa gambut yang didominasi oleh Shorea pachyphylla Ridl. ex Symington 1941, pada ketinggian 44−90 m dapl. Kelebaban bervarias antara 80−90%, dengan naungan 75−85%.

Phenology: Berbunga sepanjang tahun

Deskripsi :
Epiphytes, roots mainly near the base of the pseudobulb. Rhizome creeping, 3.2−3.8 mm diam., the section between pseudobulbs 4.2−6 cm, scale with fibers persistent. Pseudobulbs ovoid, 1.1−1.4 × 0.7−0.8 cm. Leaves: petiole 9.6−12.0 mm long; leaf blade elliptic, 18.6−19.7 × 3.7−3.9 cm, index ca. 5, obtuse to rounded.
Inflorescence varies from erect to horizontal, 1-flowered; peduncle 3−3.2 cm long. Floral bract 3, tubular, the longest ca. 9.6 mm long, sheathing, acuminate to shortly cuspidate. Flower fragrant, not resupinate and not fully opening. Pedicel and ovary ca. 34.8 mm long, ovary straight, ribs rounded, with dark purple spots near the sepal. Median sepal somewhat incurved, triangular, 33.6−36.3 × 6.8−7.1 mm, index 4.9−5.1, acute, margins entire, rather incurved, basal attachment narrowed, glabrous, 9–veined, pale pink to whitish, with scattered purple-red spots, faded towards along the middle part, paler in adaxial view. Lateral sepals incurved, free, oblique, triangular to rather ovate, 33.2−35.1 × 10.8−11.0 mm, index 3.1−3.3, gradually thickened towards the lower margin, 9-veined, the colors as same as the median with additional yellow adaxially along the lower margins.Petals reflexed, linear, subtriangular, 26.8−27.6 × 3.5–3.6 mm, index 7.6−7.7, acute, margins entire, glabrous, 5-veined, light pink with many purple-red spots. Labellum mobile, slightly recurved at the base, hastate-lyrate, 19.2−20.8 × 7.2 mm (not flattened), index 2.7−2.9, long drawn-out at the top, margin slightly concave near the base, lateral lobes present, obovate-subquadrangular, rounded, margin entire; the drawn-out top part thicker than the rest, glabrous; adaxially concave towards the base; abaxially with a distinct, emarginated ridge over ca. 1/4−1/3 of the length of the lip, cream colored with dense purple-red spots, apex and abaxial ridge yellow. Column including stelidia ca. 8.5 mm long, column foot ca. 11.3 mm long (not flattened). Stelidia porrect, deltoid to triangular, apex obtuse, wings or tooth absent along the lower margins. Anther abaxially having a distinct, flat crest, surface glabrous to rather undulate, ca. 2.1 × 2 mm. Pollinia 4, as two pairs, without appendages.

Morphology of Bulbophyllum lyriforme Illustrasi oleh F.H. Kurniawan.

Photographed by F.H. Kurniawan/Yayasan Akar Banir Indonesia.

Habitat Bulbophyllum lyriforme di Kapuas Hulu, Kalimantan Barat, Indonesia. Photographed by F.H. Kurniawan/Yayasan Akar Banir Indonesia.

Kunci identifikasi Bulbophyllum sect. Sestochilos di Kalimantan, dimodifikasi dari Vermeulen et al. (2015) :

8a. Labellum 15–35 mm long ……………….…..........………. 8’
8b. Labellum 3.5–9.0 mm long ………………….…….………...…… 9
8’a. Labellum hastate-lyrate, basal lateral lobes winglike and pointing backward ……………………….... B. lyriforme
8’b. Labellum elliptic, without basal lateral lobes …………… B. cheiri

Referensi :

Yuda R. Yudistira, Firman H. Kurniawan and Wendy A. Mustaqim. 2022. Bulbophyllum (Orchidaceae: Epidendroideae) of Indonesian Borneo: A New Species and First Record for B. lyriforme. Taiwania. 67(4); 544-551. taiwania.ntu.edu.tw/abstract/1872;