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Section of Feed and Food Microbiology, National Veterinary Institute, Ullevaalsveien 68, P.O. Box 8156 Dep., 0033 Oslo, Norway
Trude Vrålstad
Trond Schumacher
Ascomycete Research group Oslo (ARON), Division of Botany and Plant Physiology, Department of Biology, University of Oslo, P.O. Box 1045 Blindern, 0316 Oslo, Norway
A new genus and species is described to accommodate a newly discovered fungus pathogenic to Linnaea borealis. The fungus forms true sclerotia on stems and leaves of its host and apothecia arise singly or gregariously on the surface of ripe sclerotia. The new fungus was collected together with a stromatic conidiomal fungus that occurred on the same host. A putative teleomorph-anamorph connection of the observed taxa was ruled out by sequence comparison of the nuclear ribosomal internal transcribed spacer DNA sequences (ITS rDNA). Based on morphology and pathogenicity, the new fungus belongs in the family Sclerotiniaceae, Helotiales, Ascomycota. A phylogenetic analysis of ITS rDNA sequences from 26 taxa of the family Sclerotiniaceae was performed to conclude on the systematic position of the new fungus. The small tuberoid sclerotia, brownish subsessile to substipitate apothecia, four-spored asci, ellipsoid to isthmoid ascospores, inability to grow on PDA culture media and a number of ITS rDNA sequence autapomorphies characterize and distinguish the fungus from other taxa of the Sclerotiniaceae.
Key words: Botrytis, Caprifoliaceae, Ciboria, Ciborinia, internal transcribed spacer, ITS rDNA, phylogeny, ribosomal DNA, Sclerotinia, taxonomy
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