Thallus foliose, forming rosettes <20cm, upper surface blue-grey, undulate margins, dense cover of globose isidia (later claviform cilindrical). Lower surface brown-black. Apothecia very rare.
Thallus foliose, attached at a single point by a central strand (umbilicate), 3-15 cm, upper surface white-grey, when wet green-brown, with oval pustules, margins and cracks with black isidia. Apothecia very rare.
Foliose, diameter <20cm, upper surface blue-grey; lower surface pale at margin and dark in the center, dark veins and rizines 5 mm long. Characteristic apothecia saddle-shape - tubular. Cortex spot test negative.
Thallus umbilicate, diameter <10cm, upper surface pale grey, marginal schizidia to 2 mm wide; lower surface white to pale grey pink, apothecia rare. Medulla C+ and KC+ red.
Foliose, rosettes <6cm, bright lemon-yellow, sorediate margins.
Foliose, attached by a single rhizine on silicic soil. Upper surface bright green when wet. Lower surface white, pale, with reticulate villose veins with dark cephalodia. 1-6 Apothecia per lobe, <5mm diameter, rounded, flat. Photobiont chlorococcoid, cephalodia with Nostoc.
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| Pleopsidium flavum |
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| Third pitch of the climbing route "Esperó de Doppelmayer" |
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| Pleopsidium flavum on andesite from "Midi d'Ossau - Jolly (400m MD+) France" |
