Family: Physciaceae
[ Imbricaria clementiana (Ach.) J. Kickx f. , more, Lichen clementei Sm., Parmelia clementei Turner, Parmelia clementiana Ach., Parmelia columnaris Taylor, Physcia astroidea (Fries.) Nyl., Physcia astroidea f. astroidea (Bagl.) Nyl., Physcia astroidea f. hypomela Tuck., Physcia astroidea f. pollinifera Abbayes, Physcia astroidea var. astroidea (Bagl.) Nyl., Physcia astroidea var. elegans Nyl., Physcia clementiana (Ach.) J.J. Kickx, Physcia clementiana f. clementiana (Ach.) J.J. Kickx, Physcia clementiana f. pollinifera (Abbayes) Zahlbr., Physcia clementiana var. clementiana (Ach.) J.J. Kickx, Physcia clementiana var. elegans (Nyl.) Zahlbr., Squamaria clementei (Turner) Hook. f.] |
Thallus: foliose, orbicular to irregular, fragile, up to 2 cm diam, ± firmly adnate, central parts often covered by pustules dissolved into granulate soredia lobes: flat to concave, up to 0.5 mm broad, rarely broader, sparsely divided; tips: truncate or crenulate, occasionally ascending upper surface: whitish, rarely dark gray, usually dull pustules or isidia: laminal, often developing into granular soralia or craters that may fuse and cover the whole thallus upper cortex: paraplectenchymato lower cortex: ± prosoplectenchymatous, pale to brownish (inner parts) lower surface: white at the tips, darker in inner parts; rhizines: few, concolorous with the underside Apothecia: frequent, up to 2 mm diam., margin often crenulate ascospores: brown, 1-septate, Pachysporaria type, (16-) 18.5-22 (-23.5) x (7.5-) 8.5-10 (-11) µm Pycnidia: not seen Spot tests: upper cortex and medulla K+ yellow, C-, KC-, P+ yellow Secondary metabolites: upper cortex with atranorin; medulla with atranorin, lecotylin and traces of other triterpenoids visible in TLC. Substrate and ecology: growing mainly on trees but also on rocks in open sites World distribution: known from scattered localities in central and southern Europe and from southern California Sonoran distribution: known only from the Channel Islands of southern California and the adjacent mainland. |