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Images of British Lichens



Lecania naegelii (Hepp) Diederich & van den Boom
 
(= Bacidia naegelii (Hepp) Zahlbr.)


Thallus a minutely areolate, white to pale blue-green crust; apothecia 0.2-0.4(-0.6)mm diameter, sessile, discs flat to convex, pink to brown or dark grey, ascospores mostly 3-septate (variable), fusiform-ellipsoid, longer spores to 24µm. Widespread on nutrient-rich bark and twigs.

Differs from both L. cyrtella and L. cyrtellina by its longer, predominantly 3-septate ascospores. The latter species can morphologically be very similar but has a thin, ill-defined thallus. All three species can occur together. Darker variants might be confused with Micarea species but have unbranched paraphyses.

Refs: Smith et al. (2009), 460; Purvis et al. (1992), 112 (as Bacidia); Dobson (2011), 202 (photo, poorly printed); van Herk & Aptroot (2004, 2013), 198-9 (photo); Wirth, Hauck & Schulz (2013), 1: 549 (photo), 552; Frahm et al. (2010), 48 (photo, as Bacidia); Valcárcel et al. (2003), 204-5 (photo).

 
Lecania naegelii, pink apothecia
Lecania naegelii, photomicrograph
Pink variant, on twig of Ash (Fraxinus excelsior), Finlaystone, Renfrewshire, February 2011. Lower photograph shows ascospores.
 
Lecania naegelii, grey apothecia
Lecania naegelii, micrograph
Lecania naegelii, micrograph
Grey variant, on twig of Ash (Fraxinus excelsior), Finlaystone, Renfrewshire, February 2011. Lower photographs show ascospores and paraphyses.


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© A.J. Silverside
Uploaded April 2011, last updated December 2013