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Images of British Lichens

Immersaria athroocarpa (Ach.) Rambold & Pietschm.

Thallus a cracked-areolate crust, the areoles angular, smooth, brown, with pale, sinuous margins, cortex non-reactive with bleach (C-); apothecia black, flat, initially immersed; locally frequent in upland areas of North Wales and Scotland, particularly on basaltic and metalliferous rocks.

Refs: Smith et al. (2009), 443; Purvis et al. (1992), 495 (as Porpidia athroocarpa); Dobson (2011), 201-2 (photo, poorly printed); Wirth (1995), 1: 433, 2: 771, 772 (photos); Wirth, Hauck & Schulz (2013), 1: 539 (photo).

Variants of Lecidea fuscoatra (page pending) with immersed apothecia can look very similar, but test red with bleach.

Immersaria athroocarpa
On montane boulder, Braemar, Aberdeenshire, March 2008

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© A.J. Silverside
Uploaded June 2009, last updated September 2013