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Lepraria santosii Argüello & Crespo |
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Nomenclatural data
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Lichenologist 38(3): 218 (2006); type: Canary Islands, Tenerife, Las Mercedes, 28. Mar. 2005, A. Crespo (MAF—holotypus; BG, GZU—isotypi).
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Morphology
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Thallus crustose to subsquamulose, leprose, with granular, slightly squamulose appearance; whitish grey to greenish grey; relatively thin, c. 0.2 mm, relatively hard, tightly attached to the substrate at centre, loosely at margins; shape rosette to irregular fused patches, 0.5-2.5 cm in diam.; margin delimited, lobes present, distinct, with raised marginal rim; some granules may be subcorticate; medulla absent; prothallus absent; areoles absent; marginal lobes can be subsquamulose; soredia abundant, fine to medium, 20-100 µm in diam., round; pruina absent; projecting hyphae present; larger granules or warts of thallus similar to isidia in places. Photobiont green, coccoid, cells sometimes aggregated, c. 10-16 µm in diam.
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Chemistry
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Atranorin, stictic acid, constictic acid (trace), norstictic acid (trace), zeorin, roccellic acid. K+ yellow to brownish, C–, KC–, Pd+ orange.
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Remarks
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According to molecular studies very close to L. isidiata, close to L. bergensis (Crespo et al. 2006), see the discussion under L. membranacea. Earlier specimens more or less corresponding to the description of L. santosii were included in L. nivalis as a chemo- and morphotype (Leuckert et al. 1995, 2004; Baruffo et al. 2006), see the discussion under L. nivalis. Species producing isidia-like structures include L. crassissima, L. isidiata, L. santosii, L. xerophila, see the discussion under L. isidiata. Several species can develop well developed lobes, see the discussion under L. membranacea. Several species can produce stictic acid complex and atranorin, see the discussion under L. caesioalba.
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Ecology and distribution
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Substrate and ecology: soil and basaltic rock; shaded places. Distribution: Canary Islands, probably wider in Mediterranean area.
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