Images of British Lichens
Lecania cyrtellina (Nyl.) Sandst.
Thallus a very thin, filmy, smooth, greenish-white to pale grey crust; apothecia to 0.3mm diameter, sessile, discs convex, translucent white to pink or brown, paler colours distinctly green when damp, ascospores 1-septate (a few spores, according to literature, may be 3-septate), ellipsoidal, 8-12×2-3.5(-4)µm. Widespread, local or overlooked, forming small, inconspicuous colonies on nutrient-rich bark and twigs.
Refs: Smith et al. (2009), 458; Purvis et al. (1992), 288; Frahm et al. (2010), 46-7 (photo).
Paler, smaller apothecia than L. cyrtella, and with distinctly smaller ascospores; L. naegelii can be very similar but has a thicker, more-defined thallus and much longer, 3-septate ascospores. All three species can occur together.
|On branch of Ash (Fraxinus excelsior), Gifford, East Lothian, April 2008. Lower photograph shows hymenium with ascospores.|
|On twig of Ash (Fraxinus excelsior), Finlaystone, Renfrewshire, February 2011, growing over Arthonia radiata.|
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Uploaded March 2011, last modified November 2011