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Leptogium laceroides (B. de Lesd.) P. M. Jorg.
Family: Collemataceae
Leptogium laceroides image
Troy McMullin  
Thallus: foliose, 2-5 cm in diam., adnate, subdichotomously to irregularly lobate lobes: irregular, elongate, +plane, separate, sometimes crisped, 3-5 mm wide, 100-120 µm thick; apices: rotund, entire to irregularly cut and isidiate, occasionally upturned upper surface: brown to medium gray, shiny, smooth isidia: scattered to dense, usually laminal but sometimes marginal, granular to cylindrical to lobulate, simple or branched, concolorous with the thallus or darker internal anatomy: with upper and lower cortices consisting of a single layer of irregularly isodiametrical cells 7-14 µm in diam., internally with loosely interwoven chains of Nostoc and hyphae lower surface: pale to medium brown, wrinkled, with dense white tomentum of cylindrical hairs up to 1 mm long Apothecia: infrequent, laminal, sessile, 3-4 mm wide disc: light brown to dark red-brown, concave to plane to convex margin: thalline, concolorous with the thallus, entire or isidiate exciple: euparaplectenchymatous, 45-70 µm centrally hymenium: hyaline below and thinly brown above, 160-180 µm tall; paraphyses: unbranched, c. 1.5 µm wide, slightly inflated apically; subhymenium: pale yellow, 45-60 µm thick asci: cylindrico-clavate, 8-spored ascospores: hyaline, muriform, 3-7-septate transversely, 1-2-septate longitudinally, ellipsoid to subfusiform, 28-35 x 12-17 µm Pycnidia: not observed Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: on bark in montane forests World distribution: warm tempearate parts of SW Europe, North and South America, and Australasia Sonoran distribution: Arizona, southern California and Chihuahua. Notes: Leptogium laceroides appears to be the isidiate counterpart of L. burgessii, that has secondary lobules and lacks the cylindrical/granular isidia found in L. laceroides.
Leptogium laceroides image
Troy McMullin  
Leptogium laceroides image
André Aptroot  
Leptogium laceroides image
Leptogium laceroides image
Leptogium laceroides image
Leptogium laceroides image
Leptogium laceroides image