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Images of British Lichens



Pyrenula laevigata (Pers.) Arnold


Thallus more or less immersed, smooth, somewhat waxy, cream to creamy brown, scarcely forming a prothallus where adjacent thalli meet, but speckled lines of minute, black pycnidia seem to be often marginal, surface lacking pseudocyphellae; perithecia numerous, conspicuous, approx. 0.5mm or more in diameter, black, somewhat flattened in vertical section, partially projecting above the thallus surface, involucrellum present, ostioles terminal, perithecial surface in microscopic section not giving a purple-red reaction with potassium hydroxide. On smooth, rather shaded, nutrient-rich bark, especially on Hazel (Corylus), in oceanic woodland in western Britain, primarily in the "celtic rainforest" of western Scotland.

Refs: Refs: Smith et al. (2009), 778; Purvis et al. (1992), 522; Orange (2008); Dobson (2005), 378; Dobson (2011), 381; Thor & Arvidsson (1999), 313 (photo).

Pyrenula laevigata
Pyrenula laevigata, close view
On Hazel (Corylus avellana), Craighouse, Isle of Jura, May 2011, BLS meeting


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Uploaded November 2012