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 Thallus: foliose, medium-sized to large, 3-6 cm wide, thin, membrane-like, loosely attached, broadly and ±deeply lobate; lobes: 0.5-1.5(-3) cm wide, thin, 75-100 µm thick when moist, not swollen, few, ±rounded, often somewhat ascending, ±imbricate, not or indistinctly folded; upper surface: smooth to rarely somewhat pustulate, dark olive-green, black, dull, epruinose; isidia: numerous, often evenly spreading over the lobes, laminal, simple, globose, c. 0.05-0.1 mm wide, becoming short-teretiform and sometimes branched with age; lower surface: usually somewhat paler than the upper surface; Apothecia: rare, laminal, sessile with constricted base, 1.5(-2.5) mm wide; disc: flat to slightly convex, pale or dark red, usually not glossy, smooth, epruinose or sometimes pruinose when old; thalline margin: smooth, usually not prominent, usually with thick pseudocortex especially at lower parts; true exciple: rather thin, subparaplectenchymatous to euthyplectenchymatous, rarely small-celled euparaplectenchymatous; hymenium: hyaline, 90-130 µm tall; asci: narrowly clavate, 8-spored; ascospores: hyaline, narrowly fusiform to broadly acicular, (4-)6-8-celled, 42-60(-65) x (3-)4.5-6.5 µm; Pycnidia: immersed, laminal, pale; conidia: bacilliform or with slightly swollen ends, (3-)4-4.5(-6) x 1-1.5(-1.8) µm; Spot tests: all negative; Secondary metabolites: none detected.; Substrate and ecology: on base-rich bark in relatively moist, shady places, also on rock and mosses; World distribution: North America, Europe, Asia, eastern and southern Africa, Socotra, India, Hawaii, and Australasia; Sonoran distribution: throughout the mountains of Arizona, Baja California, Baja California Sur and Chihuahua.; Notes: Collema subflaccidum resembles C. furfuraceum. In the former the isidia are globose, finally becoming elongated and somewhat clavate, ±evenly spreading over a smooth thallus. In the latter species the isidia are cylindrical and mainly restricted to distinct pustules and ridges. The saxicolous Collema flaccidum is distinctly ridged and the isidia are scale-like. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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