[Lecanora pyrina (Ach.) Röhl., more] Thallus: crustose, thin or
evanescent, at first comprised of discrete, convex areoles, up
to 0.2-0.3 mm wide, becoming continuous or rimose, plane or
rugose surface: light or dark gray, dull; margin: indeterminate;
prothallus: lacking; vegetative propagules: absent Apothecia:
adnate, frequent, often becoming contiguous, up to 0.3-0.5 mm in
diam. disc: dark brown becoming black, usually becoming convex
thalline margin: concolorous with thallus or lighter, c. 0.05 mm
wide, entire, persistent or becoming excluded; excipular ring:
absent thalline exciple: 40-80 µm wide; cortex: 5-10 µm wide;
epinecral layer: sometimes present, c. 5 µm wide; cortical
cells: up to 4-5.5 µm wide, mostly unpigmented; algal cells: up
to 13.5-21.5 µm in diam. proper exciple: hyaline, 5-15 µm wide
laterally, expanding to 15-25 µm at periphery hymenium: 55-80 µm
tall; paraphyses: 2-3 µm wide, not conglutinate, with apices up
to 4.5-5.5 µm wide, darkly pigmented, forming a dark, red-brown
epihymenium;