Ethylene Production by Lichens

Twenty species of lichenicolous ascomycetes are recorded for the western Pyrenees. Capronia hypotrachynae Etayo & Diederich (on Hypotrachyna species, also known from the Canary Islands and from Papua New Guinea), Llimoniella pubescens Etayo & Diederich (on Lepraria species, also from Scotland and Papua New Guinea), Polycoccum microcarpum Diederich & Etayo (on Cladonia species, also from Scotland), Skyttea megalosporae Etayo & Diederich (on Megalospora tuberculosa ), Sphaerellothecium cinerascens Etayo & Diederich (on Cladonia parasitica ) and S. parmeliae Diederich & Etayo (on Parmelia s. str., also from Finland) are described as new.