Bryoria chalybeiformis (L.) Brodo & D. Hawksw. — Overview

Horsehair Lichen learn more about names for this taxon

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Description

 Thallus: prostrate or decumbent, usually 8-15 (-20) cm long; branching: isotomic dichotomous towards the base but becoming anisotomic dichotomous towards the apices, often entangled, angles between the dichotomies mainly obtuse; branches: irregular, often sparse towards the base, main branches: much larger than the secondary ones, sometimes straight but usually becoming twisted and foveolate or sometimes channeled, occasionally flattened, (0.3-) 0.5-1.0 (-2.0) mm diam.; surface: dark brown to olive-black, sometimes paler towards base, usually shiny; true lateral spinules absent but irregular, spinulose branches sometimes present; soralia: absent or sparse, usually tuberculate, occasionally becoming spinulose, usually narrower than the branches on which they occur; pseudocyphellae absent; Apothecia and Pycnidia: unknown; Spot tests: cortex and medulla K-, C-, KC-, usually P-, UV-; soralia P+ red; Secondary metabolites: fumarprotocetraric acid (usually in the soralia only).; Substrate and ecology: on base-rich or acid rocks and soil, occasionally on lignum, rarely on conifers, in exposed intermontane localities at all elevations, usually montane to alpine, rare in maritime regions; World distribution: circumpolar, apparently bipolar; Sonoran distribution: rare in Arizona on granite or soil, 2680-3050 m.; Notes: This species is distinguished from B. fuscescens (which normally grows on bark but has been reported to occur occasionally on soil or rock) mainly by the coarser, darker and often shiny main stems (Krog 1980). The few specimens from the Sonoran region that can be assigned to B. chalybeiformis are rather poorly developed and somewhat pale and slightly reddish (rather than greenish) tinged, but fit here better than under B. fuscescens. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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