Dimelaena lichenicola is a juvenile parasite on D. oreina and D. thysanota, developing an independent brown areolate lichenized thallus on gneiss and acid rock. It differs from D. californica primarily in producing longer conidia (6.0–10.0 × 1.0 vs. 5.0–6.0 × 1.0 µm), having a reduced thallus and minute lobes, lacking a well-developed plicate margin and a prothallus, having a different host species (D. oreina and D. thrysanota vs. D. radiata), and a different habitat (montane vs. coastal). It is reported from North America (California) and Europe (Italy).
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Vol. 116 • No. 3