Three resinicolous North American species of Mycocaliciales in Europe with a re-evaluation of Chaenothecopsis oregana Rikkinen

Abstract

This study examines what is currently known about the taxonomy, ecology and distribu- tion of three resinicolous Chaenothecopsis species in Europe. A critical re-examination of C. oregana revealed that the type material contains two taxa. For nomenclatural rea- sons the name C. oregana is rejected and two new species, C. diabolica and C. zebrina, are described. Both species occur in western North America and in Europe. Also the European population of C. montana is described in detail. All three Chaenothecopsis species mainly live in mature or old-growth forests and can be used as indicators of long forest continuity. Their European distributions, with populations in the northern conifer- ous forests and in the relict montane forests of Spain and Switzerland, indicate that they may have survived the last glaciation maximum in the same refugia as their host trees. Key