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Images of British Lichens

Arthonia arthonioides (Ach.) A.L.Sm.

Thallus a ± smooth or slightly warted, soft, very pale pink (fading to whitish) crust, or immersed; apothecia set in the thallus, flat but often becoming convex, black, rounded or elongate; ascospores mostly 3-septate. On rather dry, sheltered rocks and trunks, widespread but local. Generally recognisable in the field by the pinkish colour, but part of a large genus in which chemical tests and microscopic examination are important.

Refs: Smith et al. (2009), 158; Purvis et al. (1992), 77; Wirth (1995), 1: 126, 127 (photo).

Arthonia arthonioides
Arthonia arthonioides
Arthonia arthonioides, close-up
On Oak (Quercus) trunk, Ardilistry, Islay, May 2011, BLS meeting

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Uploaded February 2013