Images of British Lichens
Lecidella elaeochroma (Ach.) M.Choisy
f. soralifera (Erichsen) D.Hawksw.
Differs from f. elaeochroma in the production of tiny, spot-like (punctiform), convex soralia producing powdery, yellow-green soredia. Widespread, but seemingly more common in coastal woodland in the west. Usually in company with the much commoner f. elaeochroma, the thalli of f. soralifera then having a somewhat stronger greenish tinge by comparison.
Refs: Smith et al. (2009), 522; Purvis et al. (1992), 338.
Lecidella is part of the very large 'Lecidea group' of lichens – crustose species with dark or black apothecia that lack distinct 'thalline' margins, though they will usually have differentiated 'proper' margins the same colour as the disk. Microscopic examination of mature apothecia (and sadly they are often not mature) is usually necessary even to be sure of the genus, and field identification of all but a few distinctive species is risky. Dobson (2011), pp. 236-7, gives an invaluable analysis of the component genera.
|Lecidella elaeochroma f. soralifera, surrounded by L. elaeochroma f. elaeochroma, on Ash (Fraxinus excelsior), Slapton, Devon, August 2011.|
N.B. the brown objects with elongated white fluff, visible in the photographs, are scale-insects.
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Uploaded May 2013