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 Thallus: foliose, rosette-shaped, lobate; lobes: stellately radiating, becoming striate; upper surface: dark olive green, composed of only one or two discontinuous layers of cells (not a real cortex); with or without isidia or lacinae, soredia absent; photobiont: primary one a filiform cyanobacterium (Scytonema), commonly with intercalary heterocysts, secondary photobiont absent; lower surface: pale olive, pseudoparenchymatous with short celled longitudinally extended hyphae; Ascomata: apothecial, usually deep red-brown, sessile, with a thalline margin or proper margin formed by a pseudoexciple; hymenium: generally 50-100 micrometer, I+ deep blue; paraphyses: simple or sparsely branched, end cells thickened; ontogeny: hemiangiocarpic; asci: cylindrical or clavate, with apically thickened wall, 8-spored; ascospores: simple or once septate at maturity, colorless, ellipsoid, fusiform or acicular; Conidiomata: pycnidial, laminal, ostiole brown; conidia: rod-shaped, produced laterally and/or terminally; Secondary metabolites: none detected; Geography: southern and SW Europe, northern Africa as well as SW North America; Substrate: on moist siliceous rocks or on the bark of trees in somewhat closed woodland.; Notes: The distinctive olive-green color separates Koerberia from small Collema or Leptogium species. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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