Chemotypes of Dimelaena oreina (Ascomycotina, Physciaceae) in the Iberian Peninsula

Four chemotypes of Dimelaena oreina are reported from the analysis of 140 s pecimens from the Iberian Peninsula. Chemotypes II ((usnic and gyrophoric a cids) and V (usnic and stictic acids) were previously known from this area, but chemotype I (usnic and fumarprotocetraric acids) is new to the region, and chemotype VII (usnic, stictic, and gyrophoric acids) is new for the sp ecies. Chemical and phytogeographical evidence suggests that chemotypes V a nd VII are closely related. In addition to geographic distributions, phytog eographic affinities and minor morphological trends, some lichens and liche nicolous fungi growing on Dimelaena oreina chemotypes are reported.