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Lecidea lapicida (Ach.) Ach.
Family: Lecideaceae
[Lecidea confluens var. ochromela Ach.,  more]
Lecidea lapicida image
Stephen Sharnoff  
Thallus: rarely indistinct (endolithic) to usually distinct, rimose to irregularly areolate; prothallus: indiscernible to distinct, black areoles: flat, irregular, 0.1-0.4(-1) mm thick surface: white to pale gray or sometimes red to rusty red or ochre (due to incrustations of iron-oxides), smooth to rough, esorediate cortex: 10-30 µm thick medulla: white, I+ intensely violet; algal layer: 60-90 µm thick Apothecia: black, marginated, usually with a constricted base, up to 1.2(-3) mm in diam. disc: black, flat to moderately convex, dull, epruinose or (rarely) indistinctly pruinose margin: black, persistent, dull to shiny exciple: black-brown peripherally, with an 30-80(-120) µm wide unpigmented interior epihymenium: greenish black to brownish black, 10-15 µm thick hymenium: hyaline, 4575 µm tall, I+ blue; paraphyses: usually unbranched and rarely anastomosing, with swollen apical cells, 3.5-5 µm in diam. subhymenium: unpigmented or faintly green, 1065 µm thick hypothecium: unpigmented, pale ochre to medium brown asci: clavate, Lecidea-type, 40-65 x 12-16 µm, 8-spored ascospores: hyaline, simple, ellipsoid, mean values: 8.9-14.5 x 4.6-7.3 µm, length-width-index: 1.5-2.9 Pycnidia: immersed conidia: cylindrical, +straight, (11.5-)12-16(-22) x 1-1.3 µm [studied in 5 specimens] Spot tests: cortex and medulla K- or K+ yellow or K+ red, C-, KC-, P- or P+ yellow or P+ yellow-orange Secondary metabolites: stictic acid syndrome (var. lapicida) or norstictic acid syndrome (var. pantherina Ach.). Substrate and ecology: in open to exposed, alpine habitats on granites, schist and other acidic rocks, in regions with a humid climate World distribution: bipolar and extending into the tropics in alpine areas (e.g. Andes of Venezuela) Sonoran distribution: unknown but expected at the highest-most elevations (e.g.) San Francisco Peaks. Notes: In cold and humid areas Lecidea lapicida is a common and very widespread species. It is characterized by its I+ violet medulla, its medium sized ascospores, its usually pale (unpigmented to medium brown) hypothecium and its chemistry. Its thallus varies greatly: from cryptothalline to well developed.  Rusty colored specimens are rather common.  The epitheton is Latin and means "stonecutter".
Lecidea lapicida image
Stephen Sharnoff  
Lecidea lapicida image
Stephen Sharnoff  
Lecidea lapicida image
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