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SPECIES

Scientific name: Sarcoglyphis tichii Aver.
English name:
Vietnamese name:
Other name:

DESCRIPTION

Stem simple to few branched, slender, 3-10 cm long, leafy in apical half. Leaves narrowly lanceolate, 5-10 cm long. Inflorescence lateral, few branching, many-flowered panicle to 15 cm long. Flowers widely opening, 5-6 mm across; brownish purple, lip white. Dorsal sepal elliptic ovate, cucullate, 2-2.2 mm long; lateral sepals broadly obovate, 3-3.5 mm long; petals obovate, as long as sepals. Lip white, spurred, 3-lobed, 2.5-3 mm long, 3-3.8 mm wide; median lobe broadly conical, very fleshy, finely papillose, longitudinally furrowed; base of lip inside with short papillose keel and two lateral papillose callosities; side lobes semicircular, erect, with incurved frontal edge, outside with fovea appearing on adaxial surface as a broadly conical callus. Spur straight, cylindric to clavate, 1.5-2.2 mm long, inside with low longitudinal keel. Back-wall callus, 0.5-0.6 mm tall, 0.8-1.2 mm long, semicircular, laterally flattened, densely covered by large glassy papills. Column erect, 1.2-1.5 mm high, with very large rostellum as long as column. Anther cap hemispherical, with narrowly cymbiform beak, 1.5-1.7 mm long. Tegula filiform, 1.6-2 mm long, broadening to the apex into small deltoid plate; caudicles insignificant; viscidium ovate, very small; pollinia 2, ovoid, each completely divided into 2 free portions.

Perennial monopodial miniature epiphytic herb. Stem simple or few branched, slender, greenish, ribbed, usually pendulous, (3)4-6(10) cm long, 2-3(3.5) mm in diam., with (2)3-4(6) distant leaves in apical half; internodes 6-10(12) mm long. Roots few, thick, light gray to almost white, wiry, flexuose, arising from leafless basal part of the stem. Leaves sessile, articulated at the base, fleshy, elongate narrowly lanceolate, (5)6-8(10) cm long, (5)6-9(11) mm wide, slightly curved and oblique, with prominent 5-7 veins and indistinctly bilobed, acute apex; leaf sheaths 8-10(12) mm long, strongly veined. Inflorescence lateral, arising from leafless basal part of the stem, many flowered pendulous panicle to 15 cm long, with 1-4 arching branches, each branch (1)2-6(7) cm long with (3)5-15(20) spirally arranged flowers; scape and rachis greenish, marked with irregular dirty purple spots; inflorescence and floral bracts persistent, triangular ovate, concave, acute, subperpendicular to the rachis, dull greenish, speckled with dirty purple, (0.5)1-2(2.2) mm long, (0.4)0.5-0.8(1) mm wide. Scape 3-4(5) cm long, rather rigid, inflorescence axis and rachis of branches slightly zig-zag curved. Pedicel and ovary perpendicular to the rachis, cylindric, straight or slightly upward curved, longitudinally ridged, 2-3(3.2) mm long, 0.5-0.7 mm in diam., greenish, flushed with dirty-purple. Flowers widely opening, 5-6 mm across; sepals and petals uniform brownish purple; lip pure white with light purple tint on side lobes inside; column and operculum white, with light purple at apex; pollinia light dull yellow. Dorsal sepal elliptic ovate, strongly concave, cucullate, obtuse, 2-2.2 mm long, 1-1.2 mm wide, hanging above column. Lateral sepals spreading, broadly obovate, slightly oblique, blunt to round at apex, 3-3.2(3.5) mm long, 2-2.2 mm wide. Petals spreading, obovate, as long as sepals, round, entire or finely irregularly denticulate at the apex. Lip firmly attached to the column, spurred, 5-nerved, 3-lobed, 2.5-2.8(3) mm long (from the base to the apex of median lobe), 3-3.5(3.8) mm wide (when flattened); median lobe broadly conical, very fleshy, 1.2-1.4 mm long, 0.8-1 mm in diam., above finely papillose and longitudinally furrowed; base of lip inside with prominent fleshy short papillose keel and two lateral papillose callosities coming to base of side lobes; side lobes semicircular, erect, 1-1.2 mm tall and broad, with incurved frontal edge, outside at the center near the apex with prominent fovea appearing on adaxial surface as a broadly conical callus. Spur straight, cylindric to slightly clavate, 1.5-2(2.2) mm long, 1-1.4(1.6) mm wide, slightly dorsoventrally flattened and dorsally strongly concave at the base, truncate or shallowly bilobed at apex, inside near the apex on abaxial surface with low longitudinal keel. Back-wall callus large, 0.5-0.6 mm tall, (0.8)1-1.2 mm long, semicircular, laterally flattened, bilobulate at apex, raising longitudinally from base of lip on back-wall of the spur, longitudinally grooved, densely covered by large glassy papillae. Column erect, cylindric, broadening to the base, slightly forward curved, 1.2-1.5 mm high, 0.5-0.6(0.7) mm in diam., with very large down directed, conical, furrowed rostellum as long as column or slightly longer, with small callus at front of clinandrium. Anther cap hemispherical, 0.6-0.8 mm in diam., with very large narrowly triangular, slightly recurved, acuminate, cymbiform beak, 1.5-1.7 mm long, at least three time longer than operculum. Stipe (tegula) 1.6-1.8(2) mm long, broadening at apex into small deltoid plate with incurved margins (embracing frontal callus of clinandrium); caudicles insignificant; viscidium ovate, very small, 0.06-0.1 mm in diam. Pollinia 2, each completely divided into 2 free densely appressed unequal hemispheric portions, 0.4-0.5 mm across. Fruits unknown.

Type:—VIETNAM. Lam Dong province: Duc Trong district, about 30 km to the east of Dalat City, 24 April 2015, N.P.Tam, AL 12 (holotype, LE!). Figs 2, 5A-D.

Etymology:—Species name refers to the name of eminent botanist, orchid expert and lecturer at the Ho Chi Minh City University of Science—Mr. Nguyen Thien Tich.

Habitat, phenology and conservation status:—Miniature branch epiphyte. Primary and mature secondary broad-leaved evergreen humid submontane forests on granite. 1,000-1,200 m. Fl. March-April. Very rare. Estimated IUCN Red List status—DD.

Distribution:—Vietnam: Lam Dong province (Duc Trong district).

Endemic.

Notes:—Thegenus Sarcoglyphis includes 14 species distributed in tropical zones of mainland Asia and Sunda Isles. The newly discovered species differs from all its known congeners in having smaller, half-sized flowers and peculiar concavities on the side lobes appearing inside as a prominent broadly conical protuberances. This species appears fairly morphologically isolated and has a slight superficial resemblance to the relatively small-flowering, S. thailandica Seidenfaden (1988: 127), but which distinctly differs in having a very long rostellum (almost as long as column), a very long beak of the operculum, a narrow conical median lip lobe and a short septum inside the spur. The rostellum protuberance raised up at the front of the clinandrium observed in most species of the genus is reduced in the new taxa into a small ovoid callus. This feature provides similarity with some species of Cleisostoma Blume (1825: 362).

PHOTOS

Sarcoglyphis tichii.jpg at www.BotanyVN.com

Photo 1. Sarcoglyphis tichii.jpg

 

SCIENTIFIC CLASSIFICATION
Kingdom: Plantae
Division: Magnoliophyta
Class: Liliopsida
Order: Orchidales
Familia: Orchidaceae
Genus: Sarcoglyphis

PARAMETERS

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