Rinodina laxa H.Magn.
Meddel. Göteb. Bot. Trädg., 17: 277, 1947.
Synonyms:
Distribution:
Description: Thallus crustose, thinly episubstratic, continuous to granulose, whitish to grey-brown, often concealed by the dense apothecia. Apothecia lecanorine, 0.3-0.7(-0.85) mm across, broadly attached, with a dark brown, concave, flat to convex disc and a persistent, sometimes pruinose thalline margin. Thalline exciple thinly and often indistinctly corticate, the cortex 20-30 µm thick, the medulary part without crystals, I-; proper exciple colourless, 10-25 μm wide; epithecium brown, 10-15 µm high, K-; hymenium colourless, 70-110 µm high; paraphyses 1.5-2 µm thick at mid-level, the apical cells 3.8-5 µm wide; hypothecium colourless, 20-100 µm high. Asci 8-spored, clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-septate, brown, ellipsoid, (17-)18-24(-26) x (7-)8-10.5(-12) µm, Physconia-type, with an ontogeny of type A (apical wall thickening after septum formation). Pycnidi dark, immersed. Conidia 5(-6) x 1(-l.5) μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances. Note: described from neighbouring Engadin in Switzerland, this species growing on soil and plant remains may occur also in the Alps of Italy, especially in the xerothermic Alpine valleys.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Predictive model
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Predictive model
