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 Add this item to the list  833380 Original description
Remarks (public):Ecology and Distribution: Currently known only from its holotype specimen, collected on exposed lava in the transition zone of Volcán Darwin, Isabela Island. Notes: The distintcly squamulose thalli of P. ertzii with their lecanoroid apothecia cannot be confused with any other lecanoroid lichen in the Galapagos. The growth morphology of this species clearly indicates that it is best accomodated in Protoparmeliopsis. 
Description type:Original description 
Description:Thallus saxicolous, moderately thickened, distinctly placodioid, central areoles with discrete margins, marginal areoles with short lobes; surface pale beige to ochraceous, smooth, matt to ±waxy, epruinose, lacking soredia. Apothecia numerous, often very densely aggregated, circular to undulate, occasionally deformed by mutual pressure, 0.4–1.2 mm in diam., adnate to soon sessile, lecanorine, margin persistent or rarely excluded, entire to irregularly crenate, epruinose, concolorous with the thallus, disc plane to convex, deep reddish brown, epruinose; hymenium hyaline, not or sparsely inspersed with few oil droplets, epihymenium with few, minute crystals, orange brown (superba-brown: slowly dissolving in K to yellowish brown solution, HCl± orange brown, N± orange intensifying), both pigment and crystals soluble in K; proper exciple thin, indistinct, with few small crystals; thalline exciple thick, distinctly corticate, with a few small crystals soluble in K, and conspicuous large crystals, insoluble in K; subhymenium and hypothecium hyaline, inspersed with oil droplets; ascospores 8/ascus, simple, ellipsoid to broadly ellipsoid, (8.8–)9.4–11.3(–12.7) × (4.9–)5.3–6.6(–6.9) µm (n = 30). Pycnidia not seen. Chemistry: All spot tests negative, UV– (dull); no lichen substances detected by HPTLC. 
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