Slideshow image
Endocarpon petrolepideum (Nyl.) Hasse
Family: Verrucariaceae
Endocarpon petrolepideum image
Andrew Khitsun  
Thallus: squamulose squamules: scattered to adjacent, not overlapping, 0.5-1 mm wide, 0.1-0.25 mm thick, plane, broadly adnate with only the very edges slightly elevated, incised surface: brown, smooth, often with darker rims upper cortex: 10-30 µm thick, composed of angular cells (5-9 µm in diam.) medulla: composed of spherical cells 5-9 µm wide with small air spaces between them; algal layer: 30-60 µm high; algal cells: 6-10 µm in diam. lower cortex: not delimited, composed of more closely packed medullary cells whose walls darken below; rhizohyphae: hyaline to faintly brownish, 2.5-3.5 µm thick lower surface: pale brown to blackish Perithecia: broadly pyriform, up to 0.25 mm wide; apex: concolorous with or paler than the thallus; exciple: dark brown to black, c. 20 µm thick; periphyses: c. 25-35 µm long; hymenial algal cells: (sub)globose, 2.5-3.5 µm in diam. asci: clavate, c. 70 x 17 µm, 2-spored ascospores: muriform, ellipsoid, colorless to very pale brownish when overmature; the proximal and distal spores of about the same length, 25-32 x 12-16/ 25-36 x 10-13 µm Pycnidia: not seen Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: on siliceous rock in dry and sun-exposed situations World distribution: Japan and SW North America Sonoran distribution: Arizona, California (Channel Islands) Chihuahua and Sonora. Notes: The distinction from E. pallidulum may be difficult (see under that species).
Endocarpon petrolepideum image
Andrew Khitsun  
Endocarpon petrolepideum image
Endocarpon petrolepideum image
Endocarpon petrolepideum image
Endocarpon petrolepideum image
Endocarpon petrolepideum image
Andrew Khitsun  
Endocarpon petrolepideum image
Andrew Khitsun  
Endocarpon petrolepideum image
Endocarpon petrolepideum image
Endocarpon petrolepideum image
Endocarpon petrolepideum image
Endocarpon petrolepideum image
Andrew Khitsun  
Endocarpon petrolepideum image
Andrew Khitsun  
Endocarpon petrolepideum image
Endocarpon petrolepideum image
Endocarpon petrolepideum image
Endocarpon petrolepideum image