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Taxon Pages
Caloplaca magnussoniana S. Y. Kondr., Kärnefelt & A. Thell
Nomenclature
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Family: TeloschistaceaeGenus: Caloplaca
SUMMARY
Mycobank MB 517746
Thallus 1–2 cm wide, usually aggregated into larger colonies, appearing dull yellowish or dull brownish orange due to numerous apothecia, thallus areoles absent or rare, minute, to 0.1 mm wide, whitish greyish, greenish-yellow or whitish-yellowish, in the peripheral zone or among the apothecia in the centre of thallus, rarely seen as undulating fragments of a continuous yellowish film, ca. 0.3 mm wide. Apothecia 0.2–0.4(–0.55) mm diam., 0.2 mm thick, usually numerous and densely aggregated, biatorine, dull yellowish, proper margin margin 0.03–0.05 mm wide, becoming excluded, disc plane to subconvex, dull orange to dull brownish orange; in section biatorine; true exciple to 70 µm thick in the uppermost lateral portion, 10–15 µm thick in the basal portion; hymenium 70–75 µm high; paraphyses swollen towards the tips, to 4–5 µm diam., with numerous oil cells, 4–5 µm diam. (better seen in K!); ascospores broadly ellipsoid, (8–)9–12 x (5.5–)6–7 µm in water and 10–13(–15) x 7–10 µm in K, septum 3–4 µm wide in water and (3–)4–5(–6) µm wide in K. Secondary chemistry: epihymenium K+ dark purple, becoming pale, in K brownish.