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Lecidea lithophila (Ach.) Ach.

Synonyms:

Family: LECIDEACEAE

Habitat: Ubiquitous

Description

    Thallus crustose, usually thin, rimose to cracked and areolate, greyish, grey-blue, bluish, often with rusty or brown-orange spots on iron-rich rocks, sometimes delimited by a thin blackish prothallus. Apothecia immersed at first, then sessile, 0.5-1.5 mm diam., disc flat to slightly convex, more or less pruinose, brownish, brown-blackish when moist, blackish when dry, exciple distinct, thin, persitent, concolourous though lower surface is brownish. Ascospores narrowly ellipsoid, simple, colourless, 9-15 x 4-7 µm. Photobiont: Trebouxia. Thallus: C-, K-, KC-, C-, medulla: I-. Common, on iron-rich humid siliceous rocks, very common on schist slates and in slate quarry refuses but the most well developed specimen thrive on iron-rich moist siliceous rocks in humid pathways. See Lecidea lithophila forma. N.B. This species is subjected to various interpretations according to different authors. Considered here sensu lato. Extraordinarily variable, may include several taxa for which identification requires chemical spot tests. See also  Porpidia cinereoatra and Porpidia crustulata that also are I-.







Lecidea lithophila Commana 1
Bernard BOUFFINIER



Lecidea lithophila Sur schiste ardoisier Plounéour-Ménez 1
Alain GERAULT



Lecidea lithophila Cf. Poullaouen
Alain GERAULT



Lecidea lithophila Commana 3
Michel DAVID



Lecidea lithophila Roc'h Trédudon 2
Alain GERAULT



Lecidea lithophila Saint-Herbot
Alain GERAULT



Lecidea lithophila Sur schiste ardoisier Plounéour-Ménez 2
Alain GERAULT



Lecidea lithophila Sur schiste ardoisier Plounéour-Ménez 3
Alain GERAULT



Lecidea lithophila Sur schiste ardoisier Plounéour-Ménez 4
Michel DAVID



Lecidea lithophila Sur schiste ardoisier Plounéour-Ménez 5
Bernard BOUFFINIER



Lecidea lithophila Commana 2
Bernard BOUFFINIER



Lecidea lithophila Commana 4
Michel DAVID



Lecidea lithophila Pointe de Dinan 1
Bernard BOUFFINIER



Lecidea lithophila Pointe de Dinan 2
Bernard BOUFFINIER



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