Aspicilia calcitrapa Cl. Roux & A. Nordin

in Roux & al., Bull. Soc. linn. Provence, num. spéc. 14: 187, 2011.
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Description: Thallus crustose, episubstratic, 0.15-0.7 mm thick, rimose-areolate in marginal parts, areolate in central parts, brownish white, ochraceous or greenish, forming 1-8 cm wide patches, sometimes delimited by a whitish prothallus. Areoles angular, slightly concave to slightly convex, 0.2-1 mm wide. Epinecral layer 4-11 μm thick; cortex 25-35 μm thick, pale green (caesiocinerea-green pigment) in upper part, colourless in lower part, paraplectenchymatous, almost without crystals; algal layer 40-60 μm thick, continuous; medulla of very variable thickness, rich in crystals visible under polarized light, which are insoluble in N and soluble in K. Apothecia lecanorine-aspicilioid, round, 0.15-0.7 mm across, 1-2(-3) per areole, with a black, epruinose disc and an up to 0.1 mm thick thalline margin. Epithecium grey-green, 8-15 μm high, N+ emerald green (caesiocinerea-green pigment); hymenium colourless, 75-130 μm high, I+ blue then reddish brown; paraphysoids branched and anastomosing, 1.5-3 μm thick in lower part, (sub)moniliformin upper part, the apical cells 3-4.5 μm wide; hypothecium colourless, 35-50 μm high. Asci 8-spored, broadly clavate, the thin outer coat K/I+ blue, the wall and apical dome K/I-, with biseriately arranged spores. Ascospores 1-celled, hyaline, ellipsoid, (12-)14-21(-23) x (6.5)-8-12(-14) μm. Pycnidia broadly pyriform, immersed, the wall colourless except in the grey-green periostiolar region. Conidia bacilliform, 7-13 x (0.5-)1(-1.5) μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a recently-described species of inclined surfaces of calcium-free schistose rocks, mostly below the montane belt, known from the French Southern Alps, Corsica and the Pyrenees. To be looked for in Italy.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual



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Claude Roux - Source: Roux C., Nordin A., Tibell L., Sohrabi M. 2011. Quelques espèces d’Aspicilia peu connues ou nouvelles des Pyrénées-Orientales (France). Bull. Soc. linn. Provence, nr. spec. 14: 177-227.


Claude Roux - Source: Roux C., Nordin A., Tibell L., Sohrabi M. 2011. Quelques espèces d’Aspicilia peu connues ou nouvelles des Pyrénées-Orientales (France). Bull. Soc. linn. Provence, nr. spec. 14: 177-227.