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Images of British Lichens

Lecanographa grumulosa (Dufour) Egea & Torrente

Thallus a usually thick, matt, pale grey to brownish or lilac-tinged crust, surface powdery; apothecia rounded to angular and irregular, black but surface white-pruinose. On calcium-rich rocks and mortar, generally beneath overhangs where it is not exposed to direct rain, particularly on shaded church walls, sometimes initially parasitic on Dirina massiliensis, almost always close to the sea, very local but more frequent in the south.

Refs: Smith et al. (2009), 464; Purvis et al. (1992), 283 (as Lecanactis grumulosa)), 284 (as Lecanactis hemisphaerica); Dobson (2005), 206 (photo); Dobson (2011), 211-2 (photo); Puntillo (1996), plate 21 (photo, as Lecanactis grumulosa); Wirth et al. (2004), 265 (photo).

Lecanographa grumulosa
On mortar of church wall, Winterton-on-Sea, Norfolk, January 2010 (BLS meeting)

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© A.J. Silverside
Uploaded August 2013, last modified September 2013