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Images of British Lichens

Pyrenula chlorospila Arnold

Thallus thin or partly immersed, smooth, somewhat waxy, yellow-brown to olive green, forming a black prothallus where adjacent thalli meet, surface flecked with tiny, white pseudocyphellae; perithecia numerous, approx. 0.5mm or less in diameter, black, immersed in the thallus and projecting little above the thallus surface, ostioles terminal, inconspicuous, 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), 777; Purvis et al. (1992), 521; Orange (2008); Dobson (2005), 377-8 (photo); Dobson (2011), 380 (photo); Wirth et al. (2004), 278 (photo); Puntillo (1996), plate 34 (photo).

Pyrenula chlorospila in lichen mosaic
Pyrenula chlorospila, enlarged view
On bark (tree unrecorded but probably Salix), Brotherston, Pembrokeshire, May 2009

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Uploaded November 2012