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Tên Khoa học: Sarcoglyphis tichii Aver.
Tên tiếng Anh:
Tên tiếng Việt:
Tên khác:

MÔ TẢ CHUNG

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.

Mẫu chuẩn

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.

Tên gọi:

loài được đặt tên kỷ niệm chuyên gia về lan người Việt Nam là ông Nguyễn Thiện Tịch, giảng viên trường Đại học Khoa học Tự nhiên, Đại học Quốc gia Thành phố Hồ Chí Minh.

Sinh cảnh, vật hậu và tình trạng bảo tồn

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.

Phân bố

Vietnam: Lam Dongprovince (Duc Trong district). Endemic.

Ghi chú

The genus Sarcoglyphisincludes 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).

ẢNH

Sarcoglyphis tichii.jpg at www.BotanyVN.com

Ảnh 1. Sarcoglyphis tichii.jpg

 

PHÂN LOẠI KHOA HỌC
Giới: Thực vật
Ngành: Magnoliophyta
Lớp: Liliopsida
Bộ: Orchidales
Họ: Orchidaceae
Chi: Sarcoglyphis

CHỈ SỐ

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