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Peltigera venosa (L.) Hoffm.
Family: Peltigeraceae
[Lichen venosus L.,  more]
Peltigera venosa image
Stephen Sharnoff  
Thallus: squamulose, approximately circular to oblong in outline, small or medium-sized, up to 2 cm in diam., or composed of overlapping, fan-shaped lobes, 0.5-2 cm wide lobes: +flattened, separate or imbricate; margin: rounded, entire to slightly indented, flat upper surface: gray-green when dry (becoming pale to dark brown in the herbarium), bright green when wet, smooth, +shiny, etomentose and epruinose, without isidia or soredia medulla: white, with +loosely interwoven hyphae photobiont: primary one Coccomyxa and secondary Nostoc in cephalodia lower surface: white to pale brown, with conspicuous, fan-shaped, pale to dark brown veins, tomentose, erhizinate, cephalodiate; cephalodia scattered, associated with the veins, superficial, dark brown or gray, rhizinate Apothecia: frequent, 1-6 per squamule, +round to oval, sessile, marginal, up to 4 mm in diam. disc: flat, brown-black, smooth ascospores: colorless, fusiform, 3-septate, 30-47 x 7-8 ┬Ám Pycnidia: not seen Spot tests: all negative Secondary metabolites: tenuiorin, methyl gyrophorate, gyrophoric acid, phlebic acids A & B, and terpenoids. Substrate and ecology: among mosses over soil in moist habitats at relatively high elevations World distribution: temperate and boreal regions of North America, Europe and Asia Sonoran distribution: occasional at higher elevations in Arizona. Notes: Its small, green thalli with fan-shaped non-rhizinate venation and its flat round apothecia, that are practically always present, make P. venosa the easiest species in the genus to identify.
Peltigera venosa image
Lucy Taylor  
Peltigera venosa image
Troy McMullin  
Peltigera venosa image
Troy McMullin  
Peltigera venosa image
Stephen Sharnoff  
Peltigera venosa image
Stephen Sharnoff  
Peltigera venosa image
Stephen Sharnoff  
Peltigera venosa image
Stephen Sharnoff  
Peltigera venosa image
Stephen Sharnoff  
Peltigera venosa image
Stephen Sharnoff  
Peltigera venosa image
Stephen Sharnoff  
Peltigera venosa image
Stephen Sharnoff  
Peltigera venosa image
Stephen Sharnoff  
Peltigera venosa image
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