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Leptogium chloromelum (Sw. ex Ach.) Nyl.
Family: Collemataceae
Leptogium chloromelum image
Stephen Sharnoff  
Thallus: foliose, 2-7 cm in diam., adnate, irregularly lobate lobes: irregular, elongate, radiate, often anatomosing, strongly thickened (swelling markedly when wet), 1-4 mm wide, 125-500 µm thick; apices: rotund, thickened, entire or lobulate upper surface: greenish gray to medium gray, usually dull, heavily wrinkled longitudinally, not isidiate internal anatomy: with upper and lower cortices consisting of a single layer of irregularly isodiametrical cells 4-9 µm in diam., internally with loosely interwoven chains of Nostoc and hyphae lower surface: pale to greenish gray, wrinkled, with scattered tufts of white hairs Apothecia: common, often marginal, sessile, 0.5-3 mm wide disc: brown to red-brown, concave to plane margin: thalline, concolorous with the thallus, verrucose or heavily periclinally wrinkled exciple: euparaplectenchymatous, 70-115 µm thick centrally hymenium: hyaline below and thinly brown above, 105-140 µm tall; paraphyses: unbranched, 1-2 µm wide, slightly inflated apically; subhymenium: pale yellow, 25-125 µm thick asci: cylindrico-clavate, 8-spored ascospores: hyaline, muriform, 35-septate transversely, 0-1-septate longitudinally, ellipsoid to subfusiform, 20-30 x 9-12 µm Pycnidia: not observed Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: rare in the Sonoran region on bark of soft-barked oaks at intermediate elevations; elsewhere on a variety of deciduous trees World distribution: mostly subtropical to warm temperate, occurring in North America (Mexico and eastern U.S.A.) and South America (Brazil) Sonoran distribution: infrequent in Arizona, western Chihuahua and Sinaloa. Notes: Leptogium chloromelum is a characteristic species only confusable with miscolored light specimens of L. phyllocarpum, which has different apothecia without a granulose margin. Leptogium millegranum is also habitually similar, but is covered in isidia and has therefore a more granular thallus.
Leptogium chloromelum image
Stephen Sharnoff  
Leptogium chloromelum image
Stephen Sharnoff  
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image
Leptogium chloromelum image