Images of British Lichens
Cladonia arbuscula (Wallr.) Flot.
Closely similar to subsp. squarrosa (q.v.), but perhaps with more and usually somewhat shorter branches, Pd (para-phenylenediamine) test slowly pale to bright yellow, UV-. Mixed with other members of subgenus Cladina, including subsp. squarrosa, on base-poor dunes in NE Scotland. Apparently uncertain elsewhere (perhaps in East Anglia) but undoubtedly rare; many apparent records available through the NBN Gateway are likely to be a result of the "nominate subspecies problem" or use of the name to differentiate from C. mitis when the latter has been considered another subspecies of C. squarrosa.
Refs: Smith et al. (2009), 317; Ahti (1961), 101-108 (? as subsp. arbuscula, "chemical strain II"), plate 37 (photo); Wirth (1995), 1: 296.
|In dune heath, Findhorn, Morayshire, April 2009|
|In dune heath, Findhorn, Morayshire, April 2009, a separate population from above, with somewhat shorter branches|
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Uploaded August 2010, last modified March 2012