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Allocetraria sinensis Gao |
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Nomenclatural data
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Typus: China, Shaanxi, Mt. Taibai, alt. 3400 m, on ground, Gao, no. 3052 (HMAS - holotypus, UPS, LD - isotypi).
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Morphology
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Thallus erect foliose, 2-3 cm high, loosely attached to the substrate, forming tussocks, more or less dichotomously branched; lobes concave, 1-3 mm broad; upper surface greenish yellow to yellow, brown to black on the margin, smooth, slightly shiny; pseudocyphellae marginal, forming a white, continuous line; projections present, short; epicortex 3-4 µm, non-cellular; upper cortex 28-30 µm, composed of 1-2 layers of more darkstained and small cells in outer part, 2-3 layers of less stained and large cells in inner part; lower cortex 17-23 µm, 2-3 layers of cells in inner part; not double-structured, lowermost part pigmented; medulla 85-100 µm.
Apothecia not seen. Pycnidia marginal, somewhat raised; pycnoconidia filiform, 12-16 µm long.
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Chemistry
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Usnic acid (+/-) in the cortex; protolichesterinic, lichesterinic and an unidentified fatty acid in the medulla.
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Remarks
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It is a distinct member of this genus and differs from A. ambigua and A. stracheyi by a dark brown underside with pseudocyphellae forming a white line along the margin.
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Ecology and distribution
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This species grows on the ground among mosses in the alpine tundra above 3000 m. It is found only in Southwest China and Nepal.
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Literature:
Randlane, T. & Saag, A. 1993. | Randlane, T. & Saag, A. 2004. | Randlane, T., Saag, A. & Obermayer, W. 2001. | Randlane, T., Saag, A. & Thell, A. 1997. | Thell, A., Randlane, T., Kärnefelt, I., Gao, X. & Saag, A. 1995.
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