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Images of British Lichens

Pyrenula macrospora (Degel.) Coppins & P.James

Thallus thin or partly immersed, smooth, somewhat waxy, yellow- to dark-brown or various shades of green, forming a black prothallus where adjacent thalli meet, surface flecked with small, white pseudocyphellae; perithecia numerous, conspicuous, approx. 1mm in diameter, black, globose, distinctly projecting above the thallus surface, ostioles terminal, distinct when perithecia are mature, perithecial surface in microscopic section not giving a purple-red reaction with potassium hydroxide. Locally common on smooth, rather shaded bark in oceanic woodland in southern and western Britain.

Refs: Refs: Smith et al. (2009), 778; Purvis et al. (1992), 522; Orange (2008); Dobson (2005), 378 (photo); Dobson (2011), 381 (photo); Whelan (2011), 136 (photo); van Haluwyn et al. (2009), 186-7 (photos).

Pyrenula macrospora
On Ash (Fraxinus excelsior), Ballygrant, Islay, May 2011, BLS meeting
Pyrenula macrospora
On Durmast Oak (Quercus robur), Orielton, Pembrokeshire, May 2009

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Uploaded November 2012