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).
|Pink variant, on twig of Ash (Fraxinus excelsior), Finlaystone, Renfrewshire, February 2011. Lower photograph shows ascospores.|
|Grey variant, on twig of Ash (Fraxinus excelsior), Finlaystone, Renfrewshire, February 2011. Lower photographs show ascospores and paraphyses.|
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Uploaded April 2011, last updated December 2013