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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.

Lecania cyrtellina
Lecania cyrtellina, ascospores
On branch of Ash (Fraxinus excelsior), Gifford, East Lothian, April 2008. Lower photograph shows hymenium with ascospores.
Lecania cyrtellina
On twig of Ash (Fraxinus excelsior), Finlaystone, Renfrewshire, February 2011, growing over Arthonia radiata.

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© A.J. Silverside
Uploaded March 2011, last modified November 2011