Lecanora pseudosarcopidoides M. Brand & van den Boom
in van den Boom & Brand, Lichenologist, 40: 475, 2008.
Distribution: N - Ven (van den Boom & Brand 2008), TAA (van den Boom & Brand 2008).
Description: Thallus crustose, endosubstratic to thinly episubstratic, continuous to faintly rimose-areolate, sometimes slightly warted, ecorticate, yellowish grey or pale to brownish grey, forming patches to 4 cm in diam., without a distinct prothallus. Apothecia lecanorine when young, later biatorine, adpressed, broadly sessile to subglobose, 0.4-0.9 mm across, with an initially flat, later corvex, pale pinkish to dark brown, sometimes slightly pruinose disc, and a thin, prominent thalline margin tending to become of the same colour of the disc, and finally often excluded. Thalline exciple corticate, the medulla at first rich in algae, but soon these limited to the basal part; epithecium yellowish brown, with many coarse, colourless granules, N+ reddish violet; hymenium colourless, 40-50 µm high, with orange-brown granules; paraphyses simple or sparingly branched, 1.5-2 µm thick, the apical cells not markedly swollen, to 3.5 µm wide; hypothecium 60-90 µm high, colourless to pale yellow. Asci 8-spored, clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a blue outer layer, Lecanora-type. Ascospores 1-celled (rarely 1-septate), hyaline, ellipsoid, 8.5-11.5 x 3.5-4.5(-5) µm. Micropycnidia immersed, greenish brown in upper part; microconidia simple to 1-septate, slightly curved, 5.3-7.4 x 1-1.3 µm. Mesopycnidia pale brown to blackish olive in upper part; mesoconidia bacilliform, slightly curved, 4.4.-6.3 x 1.4-2.2 µm. Leptoconidia rare, often found at the margin of the hymenium; leptoconidia curved, 10-17 x 0.7-0.9 µm. Photobiont chlorococcoid. Spot tests: thallus and apothecia K-, C-, KC-, P-, UV-. Chemistry: isousnic acid.
Note: a recently-described lignicolous species found on rotting trunks of conifers, mainly in the subalpine belt, in species-poor stands, often with Parmeliopsis ambigua. It is superficially similar to L. saligna, differing in the form of the conidia and in other minor morphological characters, and is certainly much more widespread in the Alps.