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Heterodermia speciosa (Wulfen) Trevisan
Family: Physciaceae
[Alectoria speciosa (Wulfen) A. Massal.,  more]
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Stephen Sharnoff  
Thallus: foliose, orbicular to irregular, 2-3 (-4) cm diam., often coalescing with other thalli forming colonies up to 15 cm diam., ± firmly adnate, repeatedly dichotomously lobate lobes: linear, elongate, narrow, c. (0.5-) 1-2 mm, flat to convex, end-lobes without soralia, slightly widening towards apices, minutely notched, eciliate upper surface: white to cream-colored or brownish to bluish gray, ± shiny, the lobe-tips sometimes darkening, very rarely pruinose, not ascending, sorediate soredia: abundant, farinose to ± granular, gray to bluish gray, in labiate soralia, on lateral lobes, sometimes semi-capitate, starting from lateral lobules upper cortex: prosoplectenchymatous medulla: white lower cortex: prosoplectenchymatous lower surface: pale to dark brown, rhizinate; rhizines: few, scattered, short and robust, sometimes irregularly branched, usually black Apothecia: rare (not seen in Sonoran material), substipitate, 3-8 mm in diam., margin: crenate or lacinulate; disc: brown to blackish brown asci: cylindrical to clavate, 8-spored ascospores: brown, l-septate, ellipsoid, 30-37 x 14-18 Pycnidia: not seen Spot tests: cortex K+ yellow C-, KC-, P+ yellow; medulla K+ yellow, C-, KC-, P- Secondary metabolites: cortex with atranorin and chloroatranorin; medulla with atranorin, zeorin and an unidentified triterpene. Substrate and ecology: growing on sunny, but moist rocks or on tree trunks in humid conditions World distribution: widely distributed in subtropical to temperate areas, extending to northern Scandinavia (Moberg & Holmåsen 1992) Sonoran distribution: mountains of SE Arizona and the Sierra Madre Occidental region of Chihuahua and Sonora. Notes: It is characterized by the striking contrast between the blue-gray soralia and the paler thallus and the presence of lower cortex. The lower surface of H. obscurata lacks a cortex and has a rusty orange pigment. Heterodermia albicans is much smaller and contains salazinic acid (K+ yellow-red).
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Troy McMullin  
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Samuel Brinker  
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Gary Perlmutter  
Heterodermia speciosa image
Stephen Sharnoff  
Heterodermia speciosa image
Stephen Sharnoff  
Heterodermia speciosa image
Stephen Sharnoff  
Heterodermia speciosa image
Stephen Sharnoff  
Heterodermia speciosa image
Stephen Sharnoff  
Heterodermia speciosa image
Stephen Sharnoff  
Heterodermia speciosa image
Stephen Sharnoff  
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