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Lecanora argentata (Ach.) Malme
Family: Lecanoraceae
[Lecanora subfusca f. argentata (Ach.) Flot.,  more]
Lecanora argentata image
H.T. Lumbsch  
Thallus: crustose, continuous or rimose-areolate or verrucose-areolate; prothallus: white areoles: flat or verruculose, thin, opaque, ecorticate surface: yellowish white to yellowish gray or whitish gray to gray, smooth, epruinose, with an indistinct margin, esorediate Apothecia: sessile, 0.4-1.5 mm in diam., lecanorine disc: red-brown, plane, epruinose margin: concolorous with thallus, thin or thick, persistent, even, entire or flexuose, smooth, entire or verruculose or granulose, without a parathecial ring amphithecium: present, with numerous algal cells, with large crystals insoluble in K, corticate; cortex: hyaline, distinct, basally thickened, gelatinous, 15-25 µm thick laterally, (15-)20-45(-50) µm thick basally parathecium: hyaline, containing crystals insoluble in K epihymenium: red-brown to orange-brown, with pigment not dissolving in K, without crystals hymenium: hyaline, clear; paraphyses: slightly thickened or capitate (up to 4 µm wide) apically, red-brown to orange-brown; subhymenium: hyaline, 15-20 µm thick, hypothecium: hyaline, without oil droplets asci: clavate, 8-spored ascospores: hyaline, simple, ellipsoid, (10-)10.5-15.5(-16) x (5.5-)7.5-8.5(-9) µm; wall less than 1 µm thick Pycnidia: immersed, cerebriform; conidiophores: type II sensu Vobis conidia: filiform, 1722 µm long Spot tests: K+ pale yellow, C-, KC-, P- or P+ pale yellow Secondary metabolites: atranorin (major), chloroatranorin (minor), 4-dichlorogangaleoidin (minor), gangaleoidin (major) and norgangaleoidin (minor). Substrate and ecology: on bark or wood World distribution: cosmopolitan, known from Africa, Asia, Australasia, Europe, North America, and South America Sonoran distribution: Arizona and Chihuahua. Notes: Lecanora argentata is recognized by the presence of the gangaleoidin chemosyndrome and apothecia with an amphithecium containing large crystals and a clear, egranulose epihymenium. Morphologically and chemically similar is L. chlarotera that differs in having crystals in the epihymenium and a pigment that dissolves in K. Lecanora subrugosa sensu Brodo is also quite similar, but lacks the gangaleoidin chemosyndrome and has a more coarsely verrucose thallus and the spore walls are thicker.
Lecanora argentata image
Andrew Khitsun  
Lecanora argentata image
Lecanora argentata image
Andrew Khitsun  
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Andrew Khitsun  
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Andrew Khitsun  
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image
Lecanora argentata image