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Myelochroa aurulenta (Tuck.) Elix & Hale
Family: Parmeliaceae
[Hypotrachyna aurulenta (Tuck.) Krog & Swinscow,  more]
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Stephen Sharnoff  
Thallus: foliose, moderately to loosely adnate, ± circular, 4-10 cm broad, subdichotomously to irregularly lobate lobes: sublinear to subirregular, 2-4 mm wide, sinuous in the axils, contiguous to somewhat imbricate; apices: subrotund; margin: entire or crenulate, ciliate; cilia: short, up to 0.8 mm, mostly in lobe axils upper surface: pale green to bluish gray (whitish gray in herbarium), shiny, smooth to rugulose centrally, sorediate soredia: farinose to granular, arising from coarse pustules or soralia that become broad and diffuse; isidia: absent medulla: white to pale yellow, yellow-orange under the soralia; algal layer continuous lower surface: black with a brown zone (1-5 mm wide) peripherally, smooth to rugulose, densely rhizinate; rhizines: simple to furcate, or squarrosely branched Apothecia: rare, sessile to subpedicellate, 2-5 mm diam. ascospores: poorly developed, 10-12 x 5-7 µm Pycnidia: rare, immersed conidia: bifusiform, 5-6 x 1 µm Spot tests: cortex: K+ yellow, C-, KC-, P-; medulla: K-, C-, KC-, P- or pigmented area turning darker yellow in K Secondary metabolites: upper cortex with atranorin and chloroatranorin and secalonic acid A; medulla with zeorin, leucotylic acid, and, where pigmented, secalonic acid A. Substrate and ecology: on trees and rocks, in woodlots and along roads in open habitats World distribution: pantropical, eastern North America and Japan Sonoran distribution: rare in the mountains of SE Arizona and extending southwards along the Sierra Madre Occidental in Chihuahua.
Myelochroa aurulenta image
Troy McMullin  
Myelochroa aurulenta image
Gary Perlmutter  
Myelochroa aurulenta image
Gary Perlmutter  
Myelochroa aurulenta image
Stephen Sharnoff  
Myelochroa aurulenta image
Stephen Sharnoff  
Myelochroa aurulenta image
Stephen Sharnoff  
Myelochroa aurulenta image
Stephen Sharnoff  
Myelochroa aurulenta image
Stephen Sharnoff  
Myelochroa aurulenta image
Myelochroa aurulenta image
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Gary Perlmutter  
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Andrew Khitsun  
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Andrew Khitsun  
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Gary Perlmutter  
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Myelochroa aurulenta image
Myelochroa aurulenta image
Myelochroa aurulenta image
Andrew Khitsun  
Myelochroa aurulenta image
Myelochroa aurulenta image
Myelochroa aurulenta image
Myelochroa aurulenta image