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Images of British Lichens

Cladonia convoluta (Lam.) Anders

Closely similar to C. foliacea, of which it may be merely an ecotype, differing principally in larger size and relatively somewhat broader, more raggedly-lobed basal squamules. Thalli in the photographed material below further differed from adjacent C. foliacea in the greater abundance of tiny, black cilia on the squamule margins and dry squamules held more erect and somewhat twisted together (unfortunately this state not photographed). On sunny, rocky, usually coastal, calcareous slopes in the south of England, predominantly on chalk or limestone, declining and surviving in only a few, scattered localities, perhaps now mostly in the Mendips.
British Red Data Book species: vulnerable (this may be outdated); scheduled protected species, Wildlife and Countryside Act 1981 (added to Schedule 8 in 1998).

Refs: Smith et al. (2009), 325; Purvis et al. (1992), 207; Dobson (2005), 136; Dobson (2011), 144; Jahns (1983), 220-221 (photo); Wirth (1995), 1: 312, 313 (photo); Wirth, Hauck & Schulz (2013), 1: 388 (photo) & 389; Lichen Atlas of the British Isles 2: 377 (1996).

Ahti & Stenroos (in Nordic Lichen Flora 5 (2013)) include this species within C. foliacea, citing recently published analyses. Alternatively it can be considered a separate subspecies, as C. foliacea subsp. endiviifolia (Dicks.) Boistel.

Cladonia convoluta
Cladonia convoluta, with podetium
In thin, coastal, south-facing turf, The Warren, South Devon, June 2010.  Formerly a noted site for C. convoluta (see Hawksworth (1980)
Field Studies 5: 195–227) but by 2010 in very small quantity, with much of the presumed former area covered by Gorse (Ulex europaeus).

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Uploaded January 2014