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Images of British Lichens



Lecania cyrtella (Ach.) Th.Fr.


Thallus a thin, ± smooth, white or pale grey crust; apothecia to 0.5mm diameter, sessile, discs convex, translucent pale to dark red-brown, drying dark brown, ascospores 1(-3) septate, ellipsoidal, 10-16×(3-)4-5µm. Widespread and locally common, forming small colonies on nutrient-rich or -enriched bark and twigs, notably Ash (Fraxinus) and Elder (Sambucus), a member of the nitrophilous Xanthoria-Physcia community.

Refs: Smith et al. (2009), 458; Purvis et al. (1992), 288; Dobson (2005), 203 (photo); Dobson (2011), 208-9 (photo); Wirth (1995), 1: 446 (photo); Wirth, Hauck & Schulz (2013), 1: 552 (photo), 553; Frahm et al. (2010), 46-7 (photo); van Herk & Aptroot (2004, 2013), 196-7 (photo).

 
Lecania_cyrtella
Lecania_cyrtella
Lecania_cyrtella, ascus and ascospores
On branch of Ash (Fraxinus excelsior), Gifford, East Lothian, April 2008. Lowest photograph shows hymenium with asci and ascospores.


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Uploaded March 2011, last updated December 2013