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| Gastrochilus deltoglossus T.C. Hsu, S.I Hsieh, J.H. Wu & H.C. Hung
in Hsu, Hsieh, Wu & Hung, 2018.
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Abstract
A new species, Gastrochilus deltoglossus, is described and illustrated from Taiwan. This species is characterized by the presence of pendulous stems, leaves without awned apex, 3.5–4.0 mm tall subconical hypochile, and broadly deltoid, ciliate, adaxially sparsely short-hairy epichile that are approximately as wide as hypochile. Notes on its distribution, ecology, conservation status and taxonomic affinities are presented.
Keyword: Gastrochilus ciliaris, Gastrochilus raraensis, Orchidaceae, Taiwan, Taxonomy
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| Fig. 2. Line drawing of Gastrochilus deltoglossus, from J.H. Wu 525. A–B. Flowering habits (A, bottom view; B, top view). C. Leaves. D. Inflorescence. E. Bract. F–H. Flower (F, top view; G, side view; H, front view). I. Dorsal sepal. J. Petal. K. Lateral sepal. L–N. Lip and column (L, top view; M, side view; N, front view). O–P. Anther cap (O, top view; P, bottom view). Q–S. Pollinarium (Q, top view; R, side view; S, bottom view).
Illustrated by Hsin-Chieh Hung.
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| Fig. 1. Morphology of Gastrochilus deltoglossus, from J.H. Wu 525. A–C. Flowering habits. D. Leaf. E–H. Flower (E, top view; F, front view; G–H, side view). I. Dorsal sepal, adaxial view. J. Petal, adaxial view. K. Lateral sepal, adaxial view. L–N. Lip and column (L, front view; M, top view; N, side view). O–P. Anther cap (O, top view; P, bottom view). Q–S. Pollinarium (Q, top view; R, side view; S, bottom view). T. Capsules.
Scale bars: A = 5 cm. B–D & T = 1 cm. E–N = 5 mm. O–S = 1 mm.
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Gastrochilus deltoglossus T.C. Hsu, S.I Hsieh, J.H. Wu & H.C. Hung, sp. nov.
Type: TAIWAN. Nantou County: Ren'ai Township, 2000–2500 m elev., 8 Jun 2018, J. H. Wu 525 (holotype: TCF!; isotypes: TAIF!, TNM!).
Diagnosis: This new species is similar to Gastrochilus raraensis, from which it differs in having a wider (3.0–3.5 vs. ca. 2.0 mm) saccate lip hypochile and a smaller, deltoid (vs. semiorbicular to reniform), adaxially sparsely short-hairy (vs. densely long hairy) lip epichile. It is also similar to G. ciliaris but can be differentiated on the basis of its pendulous (vs. creeping) stems, larger (3.5–4.0 vs. 2.0–3.0 mm long) tepals, much larger (3.5–4.0 mm tall and 3.0–3.5 in diam. vs. 1.5–2.0 mm tall and ca. 2.0 mm in diam.) subconical (vs. semispherical) lip hypochile with acute (vs. rounded) bottom, and obtuse (vs. rounded or emarginate) epichile.
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Chinese name: 三角唇松蘭.
Etymology: The specific epithet is a combination of “delta”, triangular, and “glossus”, tongue, derived from the characteristic deltoid lip epichile of the new species.
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| Gastrochilus deltoglossus T.C. Hsu, S.I Hsieh, J.H. Wu & H.C. Hung
in Hsu, Hsieh, Wu & Hung, 2018.
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Tian-Chuan Hsu, Szu-I Hsieh, Jin-Hua Wu and Hsin-Chieh Hung. 2018. Gastrochilus deltoglossus (Orchidaceae: Epidendroideae: Vandeae: Aeridinae), A New Species from Taiwan. Taiwania. 63(4); 360-365. DOI: 10.6165/tai.2018.63.360
