Allocetraria sinensis Gao

Nomenclatural data
Typus: China, Shaanxi, Mt. Taibai, alt. 3400 m, on ground, Gao, no. 3052 (HMAS - holotypus, UPS, LD - isotypi).
Morphology
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.
Chemistry
Usnic acid (+/-) in the cortex; protolichesterinic, lichesterinic and an unidentified fatty acid in the medulla.
Remarks
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.
Ecology and distribution
This species grows on the ground among mosses in the alpine tundra above 3000 m. It is found only in Southwest China and Nepal.
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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