ISBN 82-7420-005-5. ISSN 0800-6865.
A total of 29 pyrenomycetous species on Salix in Troms, N Norway are treated. Two new species are described: Herpotrichiella collapsa G. Mathiassen and Lophiotrema boreale G. Mathiassen. A new combination is proposed: Platystomum curtum (Fr.) G. Mathiassen. New to Scandinavia is Glyphium schizosporum. Nine species are new to Norway: Anthostomella melanotes, Keissleriella cladophila, Lophiostoma quadrinucleatum, Lophiotrema nucula, Melanomma fuscidulum, Platystomum curtum, Rebentischia massalongii, Rhynchostoma minutum and Saccardoella transsylvanica. Eleven species are new to Troms: Amphisphaerella xylostei, Berlesiella nigerrima, Chaetosphaeria pomiformis, Cryptodiaporthe salicella, Diatrype bullata, Enchnoa infernalis, Hysterographium elongatum, Kirschsteiniothelia aethiops, Leptosphaeria hendersoniae, Lophiostoma macrostomoides and Platystomum compressum. The remaining six species have previously been reported from Troms: Arthropyrenia lapponina, Bertia moriformis var. moriformis, Cryptosphaeria subcutanea, Hypoxylon macrosporum, H. mammatum and Melanomma pulvis-pyrius.
A dichotomous key is followed by descriptions of the species in alphabetic order. The ecology and systematics of the different species are discussed, and some difficult genera are commented upon. Comments are given on the ecology and distribution of the different Salix species in Troms.
Keywords: Ascomycetes, Distribution, Ecology, Norway, Pyrenomycetes, Salix, Taxonomy, Troms.
Geir Mathiassen, Tromsø Museum, Univ. of Tromsø, N-9000 Tromsø, Norway.