天保盆距兰Gastrochilus tianbaoensis
Type:—CHINA. Yunnan: Malipo County, Tian Bao, limestone forest, 1000 m, 23 Nov 2015, Liu 210 (holotype: HITBC!).
Gastrochilus tianbaoensis is similar to G. acinacifolius Tsi (1989: 25), G. brevifimbriatus Yi (2010: 114) and G.guangtungensis Tsi (1996: 139), but can be distinguished from them by its brownish purple stripe on the midribs of leaves with sparse brownish purple spots and cupular hypochile without purple spots on exterior and with 1 ridge on the outside of hypochile.
Epiphytic herbs, stems 4.0–11.0 cm, compressed terete, 2.6–3.6 mm diam. Leave dark green with brownish spots and purple stripe on the midribs (especially fresh leaves), distichous, falcate to lanceolate, 4.4–7.2 × 0.9–1.5 cm, acute, unevenly bilobed with awns (fresh leaves), base sheathed and jointed; leaf sheaths tightly amplexicaul, 5–7mm. Inflorescence opposite to leaves, subumbellate, 3–5-flowered; peduncle 0.9–1.2 cm, with 2 or 3 tubular sheaths at base. Floral bracts triangular, small, 1–2 mm; pedicle and ovary 0.6–0.8 cm. Flowers widely opening, sepals and petals yellow-green with purplish red spots; lip white, with yellow and purple-red spotted cushion on epichile. Dorsal sepals, obovate, concave, 4.1–5.2 × 2.1–2.3 mm, apex obtuse; lateral sepals obliquely obovate, concave, 3.7–4.5 × 2.0–2.2mm, apex obtuse; petals obovate—lanceolate, concave, 3.4–4.3 × 1.5–1.7 mm, obtuse. Lip with an epichile and a saccate hypochile; epichile ovoid to oblong, around 1/3 the height of hypochile, adaxially glabrous, margin irregularly denticulate, 1.7–2.1 × 4.1–4.3 mm; hypochile white, cupular, 3.3–4.8 mm tall, 3.0–3.2 mm in diam., margin with purple stripes, bottom yellow with purple spots, out sides with 1 ridge. Column stout, ca. 2 mm; anther cap galeate, narrowly triangular with recurved-acuminate apex, 1.6 × 1.7 mm; pollinia 2, ca. 0.8 mm in diam.; stipe elongate, ca.1.6 mm; viscidium elliptic, thick and bilobed; rostellum bilobed with acuminated tip, and arising an horn–like awn from the center of each lobe (obvious in the lateral view). Capsules cylindrical with 3 significant ridges, 24–30 × 8–8.5mm.
Epiphytic herbs, stems flattened cylindrical, 4.0-11.0cm long, 2.6-3.6mm thick. |
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Leaves biseriate, sickle lanceolate, 4.4-7.2 × 0.9-1.5 cm in length and width, apex acute, with uneven 2-lobed and 2 short awns ( fresh leaves ), on the midrib ( especially fresh leaves ) left dark green with brown spots and purple stripes, basal sheath and node ; leaf sheaths tightly clasping stems, 5-7 mm. |
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Inflorescence stalk opposite to leaf, subumbel, 3-5 flowers ; peduncle 0.9-1.2 cm, with 2 or 3 tubular sheaths at base. Bracts triangular, small, 1-2 mm ; the pedicel and ovary are 0.6-0.8 cm long. Flowers bloom, sepals and petals yellowish green with purple spots ; lip white, with yellow and purple red spotted pads on testa. Back sepals, obovate, concave, 4.1-5.2 × 2.1-2.3mm, apex obtuse ; lateral sepals obliquely obovate, concave, 3.7-4.5 × 2.0-2.2 mm, apex obtuse ; petals obovate-lanceolate, concave, 3.4-4.3 × 1.5-1.7 mm, obtuse. The lip has an episperm and a cystic ovule ; upper seed coat ovoid to oblong, about 1 / 3 of hypocotyl height, adaxial glabrous, margin irregularly denticulate, 1.7-2.1 × 4.1-4.3 mm ; hypocotyls white, cup-shaped, 3.3-4.8 mm high, 3.0-3.2 mm in diameter, purple stripes at margin, yellowish purple spots at bottom, 1 ridge at outside. Columns stout, ca. 2 mm ; anthers helmet-shaped, narrowly triangular with an acuminate apex, 1.6 × 1.7 mm ; pollen stalk 2, ca. 0.8 mm in diameter ; handle elongated, ca. 1.6 mm ; viscous elliptic, thick and double-leafed ; bilobed coracoid with a pointed tip, growing a hornlike awn from the center of each lobe ( lateral view apparent ). Capsule cylindrical, with 3 distinct ridges, 24-30 × 8-8.5 mm. |
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