Our review of Lecanora and related genera in the Galapagos reported thirty-four species, fourteen as new. Based on morphological similarities species were treated, largely for convenience, within informal groups. In Galapagos species in the Lecanora subfusca-group, the core of Lecanora, form the largest group; growing mostly on bark, rarely on rock. They have lecanorine, usually sessile apothecia with pale to deep reddish brown, rarely ± blackened, epruinose discs, a thalline exciple with either large crystals insoluble in K and/or small crystals, usually soluble. Their thalli are granular to rimose, or areolate, with a white or pale to dark grey, rarely greenish or yellowish surface (L. queenslandica-group); all have filiform conidia. Ten species in this group produce atranorin, the other two usnic acid. Seven Galapagos species can be assigned to the L. marginata-group, all on rock. They share immersed to adnate, rarely sessile, biatorine to lecideine or cryptolecanorine apothecia, with or without a thalline exciple. Thalli are contiguous to rimose-areolate, white to grey, sometimes pale bluish, greenish or creamish, not yellowish. Areoles are undulate to crenate, often distinctly serrate and closely interlocked. Species in this group produce atranorin and terpenoids, often anthraquinones and xanthones, rarely usnic acid. Two Galapagos species are in the L. pallida-group, characterized by lecanorine apothecia with white to pale brown, strongly pruinose discs and thick thalline exciples filled by small crystals soluble in K. Their thalli are continuous to rimose-areolate, white to ivory-white, occasionally pinkish. Species typically produce b-orcinol depsidones in addition to atranorin. Three Galapagos species are in the L. pinguis-group, with areolate to placodioid, often convoluted, pale greenish to deep yellow thalli, due to xanthones, rarely also with usnic acid. Six species belong to the heterogeneous L. varia-group. They share characteristics with Vainionora and the L. subfusca-group, and characters used to distinguish them are reviewed.
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