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Caloplaca mereschkowskiana S. Y. Kondr. & Kärnefelt
Nomenclature
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Family: TeloschistaceaeGenus: Caloplaca
SUMMARY
Mycobank MB 517747
Thallus 0.5–2 cm wide, usually aggregated into larger colonies, appearing dull orange or brownish orange due to the numerous apothecia, thallus areoles yellowish white to greenish yellow-white or brownish, very thin, immersed and indistinct in the peripheral zone to rather thick and areolate in the centre, areoles immersed and almost indiscernible at the periphery to distinct in the centre, (0.2–)0.3–0.8(–1.3) mm wide, 0.3–0.4 mm thick. Apothecia 0.2–0.5(–0.7) mm diam., 0.15–0.22 mm thick, numerous, immersed at first, becoming sessile, 1–2 per areole, aggregated but regularly rounded, rarely crowded; disc plane to subconvex, dull orange, brownish yellow to brownish orange or somewhat orange-pink, ± with sparse whitish pruina; biatorine in section with a slightly paler proper margin, 0.03–0.05 mm wide, becoming excluded or very rarely zeorine; thalline exciple developed only at the base, 70–80 µm thick, cortical layer 10–15 µm thick; hymenium 50–60 µm high, hyaline, epihymenium brownish orange; subhymenium 80–100 µm thick; paraphyses swollen towards the tips to 4-6(–7) µm diam., usually with oil droplets 1–2(–4) µm diam., very rarely with oil cells 5–6(–7) µm diam. present; asci (1–2–4–6–)8-spored, bipolar and simple spores seen in the same ascus; ascospores distinctly widened at the septum, with rounded ends, varying from elongate-ellipsoid to almost spherical, (9–)10–12(–15) x 6–7 µm in water and 10–13(–14) x (5–)6–7(–8) µm in K (often with wrinkled surface in K), and rather narrow septa, 3–4(–6) µm wide in water and (4–)5–7 in K. Secondary chemistry: thallus K+ purple, epihymenium K+ purple or blackish purple in places, then dark cherry blossom pink to dark cherry blossom red; containing parietin (major), parietinic acid (minor), fallacinal (trace), teloschistin (trace).