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Chiodecton pustuliferum Aptroot
Nomenclature
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Family: RoccellaceaeGenus: Chiodecton
SUMMARY
Mycobank MB 17754
Thallus corticolous, crustose, pale brownish along the margins, whiter at the centre of the areoles, dull, consisting of ca. 0.4–4 mm diam crenate thallus areoles of irregular surface and outline on a continuous layer of brown arachnoid hypothallus that is underlying the whole thallus, covering areas of up to 7 cm diam, margins delimited by a continuous hypothallus, forming a line of up to 1 mm. Hypothallus filaments 2–3 µm wide, surface partly rough from crystals. Pustules numerous, erumpent, starting round, up to 3.0 mm diam and generally ca. 1.0 mm high, scarcely confluent, white (contrasting with the thallus), globular to irregular. Soredia formed inside the pustules, granular, ca. 100–200 µm diam, partly clustering into aggregates, internally formed of branched and gnarled hyphae with copious crystals. Algae trentepohlioid, cells ellipsoid, ca. 10 × 15 µm, identical in thallus and soredia. Apothecia and pycnidia unknown. Secondary chemistry: roccellic acid.