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Images of British Lichens

Fuscidea recensa (Stirt.) Hertel, V.Wirth & Vězda

Thallus cracked, of pale- to brown-grey areoles that are closely set, revealing little of the black prothallus except at the thallus margin (compare F. gothoburgensis), and which are irregularly convex, the surfaces breaking down to become initially whitish soralia that may become brown and run together, chemical tests (C, K, Pd) negative; apothecia rare, black, lecideine, ascopores ± kidney-shaped. On exposed, hard rocks and boulders, frequent in the north and west.

Refs: Smith et al. (2009), 411; Purvis et al. (1992), 256.

Gilbert et al., in Smith et al. (op. cit.), note that the photograph in Brodo (2001) is "not this species". It is evident also from the written description and internet photographs that the American interpretation of this species is significantly different.

Fuscidea recensa
Fuscidea recensa, showing soralium
On basalt rock, Isle of Muck (BLS meeting), June 2012

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Uploaded July 2012