Orchids of New Guinea

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Bulbophyllum papuaense

Bulbophyllum papuaense X.H.Jin, in Lin D, Zhou K, Hidayat A, Jin X-H, Bulbophyllum papuaense (Orchidaceae), a new species from Indonesia. In: Jin X-H, Xia N-H, Tan Y-H (Eds) Plant diversity of Southeast Asia-II. PhytoKeys 138 (2020) 125–130, fig. 1-3. https:// doi.org/10.3897/phytokeys.138.38714

Type: Xiaohua Jin 17434 (holo BO; isoPE)

Epiphyte. Roots spreading. Rhizome very slender, creeping or pendulous, minutely warty c. 0.04 cm diam; scale leaves at base tubular and minutely warty, with long, narrowly triangular somewhat patent top. Pseudobulbs appressed to the stem, elliptic, fleshy, c. 0.22 by 0.1 cm, 1-leaved, subtended by a long membranous scale leaf. Leaf subsessile, elliptic to ovate, c. 1.4 by 0.6 cm; apex mucronate; median nerve sunken. Inflorescence solitary, 1-flowered; peduncle short, slender, c. 0.1 cm long, its base covered by a long scale leaf; floral bracts , 0.3–0.5 cm long, at base tubular, apex caudate. Flowers small, wide open. Median sepal oblong, c. 0.55 by 0.2 cm; margin ciliate; apex attenuate to acuminate; 3-nerved. Lateral sepals connate, synsepalum boat-shaped, c. 0.42 by 0.3 cm; margins ciliolate; apex broadly acute; mentum conspicuous, conical, c. 0.1 by 0.05 cm. Petals at base narrowly triangular, c. 0.27 cm long, 1-nerved; margin ciliate; apex c. 3x the length of the basal part, long linear-caudate, ciliate. Lip linear, recurved in top half, c. 0.26 cm long; lip base with a small triangular protuberance; top half of lip ciliate, the hairs at the apex longer, apex slightly widened, obtuse. Column c. 0.12 cm long; column foot 0.1 cm long; stelidia triangular, c. 0.02 cm long, acute, with a triangular, acute tooth along the upper margin; pollinia 2. (After Lin, Zhou, Hidayat and Jin, 2020)

Colours:

Rhizome brown. Leaves green when young turning reddish purple. Sepals and petals maroon with darker nerves, white at the base; ciliae white. Lip maroon with short white hair. Column white

Habitat:

Evergreen broadleaved montane forest, on trunks covered with moss. Altitude 1700–1900 m

Distribution:

Malesia (New Guinea).

Distribution New Guinea:

Indonesia (Papua Barat Prov., Arfak Mountains, Mokwan); see map

Cultivation:

Cold growing epiphyte, keep moist and shaded

Flowering time in the wild:

August

Classification:

Family Orchidaceae
Subfamily Epidendroideae
Tribe Dendrobieae
Subtribe Bulbophyllinae
Genus Bulbophyllum
Section Monanthes
Species Bulbophyllum papuaense

Notes:

Bulbophyllum papuaense is similar to Bulbophyllum stemonochilum J.J.Verm., but differs a.o. in the warty rhizome with warty scale leaves (versus rhizome entirely covered and scale leaves not warty), the widely spaced pseudobulbs (versus pseudobulbs quite close together), the long caudate, ciliate petals (versus petal ovate-triangular and apex with 3 short teeth), and the lip which is hairy on the top half (versus lip hairy in the middle only, the top part glabrous).

Bulbophyllum papuaense is also similar to Bulbophyllum stenochilum Schltr., but differs a.o. in the ciliate sepals and petals (versus all glabrous), the petals are in addition about as long as the lip and very long caudate (versus c. 2/3rd the length of the lip and much shorter caudate.