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Stereocaulon delisei Bory ex Duby


Thallus greyish white, initially squamulose but then with suberect to erect, pale pinkish-orange, stem-like pseudopodetia, these bearing ± flattened, whitish-grey, deeply crenate scales (phyllocladia), which are numerous at the bases of the pseudopodetia and often fused laterally to form crusts, phyllocladia much smaller and sparser on upper parts of pseudopodetia; soralia yellowish in subglobose or globose clusters on the upper branches; thallus testing faintly yellow with Pd (para-phenylenediamine); cephalodia and apothecia rare. Very local on exposed, siliceous rocks and metalliferous mine spoil in the north and west.

Refs: Smith et al. (2009), 861; Purvis et al. (1992), 579; Krog et al. (1994), 279 (photo); Thor & Arvidsson (1999), 327 (photo).

The phyllocladia may be minutely grey at the centre; difficult material can be distinguished from S. vesuvianum by a Pd test.

Stereocaulon delisei
Stereocaulon delisei
Stereocaulon delisei
Stereocaulon delisei
On upland, metalliferous mine spoil, Nenthead, Cumberland, August 2012


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© A.J. Silverside
Uploaded August 2012