Lecanora

Bungartz, Frank, Elix, John A. & Printzen, Christian, 2020, Lecanoroid lichens in the Galapagos Islands: the genera Lecanora, Protoparmeliopsis, and Vainionora (Lecanoraceae, Lecanoromycetes), Phytotaxa 431 (1), pp. 1-85 : 20

Lecanora pallida- group (possibly including the L. subcarnea -group; Figs. 6–7 )

The two species of the L. pallida- group recorded from the Galapagos are characterized by lecanorine apothecia with white to pale brown, strongly pruinose discs and thick thalline exciples filled by small crystals soluble in K. Their thallus is continuous to rimose or rimose-areolate, with a white to pale creamy ivory-white (occasionally pinkish) surface. They typically produce β -orcinol depsidones (e.g., norstictic, protocetraric, psoromic, salazinic, stictic, and virensic acids) in addition to atranorin .

Figures

FIGURE 6. Species in the L. pallida-group. A–B. Lecanora caesiorubella. A. Rimose-areolate thallus with fimbriate white prothallus (Bungartz, F. 4466, CDS 28552). B. Thick exciple of thin-walled radiating hyphae, evenly pale brown throughout, inspersed by minute crystals (Aptroot, A. 64592, CDS 31165). C–G. Morphological variation of Lecanora cerebriformis. C–D. Specimen with continuous to barely rimose, not distinctly cerebriform thallus (Bungartz, F. 10260, CDS 47679). C. Thallus flat, only where apothecia form in the center the thallus becomes barely convoluted. D. Thick exciple of thin-walled radiating hyphae, evenly pale brown throughout, inspersed by minute crystals. E–G. Strongly cerebriform specimens. E. Thallus (Bungartz, F. 5215, CDS 29428). F. Lecanora-type asci (Bungartz, F. 6633, CDS 34853–holotype; in Lugol’s iodine, DIC). G. Thick exciple of thin-walled radiating hyphae, evenly pale brown throughout, inspersed by minute crystals (Bungartz, F. 6633, CDS 34853–holotype). Scales: A, C & E = 5 mm; B, D & G = 100 µm; F = 10 µm.

FIGURE 7. Species in the L. pallida-group. A–D. Morphological variation of Lecanora cerebriformis. A. Mosaic of moderately convoluted, white thalli with apothecia of Lecanora cerebriformis and strongly convoluted sorediate thalli of L. cerebrosorediata with few apothecia (Bungartz, F. 8759, CDS 44640). B. Strongly convoluted, ‘cerebriform’ thallus (Bungartz, F. 5215, CDS 29428). C. Gnarled ‘cerebriform’ thallus (Bungartz, F. 5215, CDS 29428). D. Exuberantly coralloid ‘cerebriform’ thallus (Bungartz, F. 6633, CDS 34853– holotype). Scales: A, B, C & D = 5 mm.