ibclogo XVI International Botanical Congess

Abstract Number: 4475
Poster No. = 150


A REEVALUATION OF PREDATORY ORBILIACEOUS FUNGI:PHYLOGENETIC ANALYSIS USING rDNA SEQUENCE DATA


G. Hagedorn1 & M. Scholler2, 1Federal Biol. Research Center f. Agriculture & Forestry, Königin-Luise 19, Berlin, Germany, 2Arthur Herbarium, Botany & Plant Pathology, Purdue Univ., West Lafayette, Indiana


A 1.2 kb long fragment (3' half of 18S rDNA, 5.8S rDNA, ITS1, and ITS2) was sequenced in 20 strains of predatory hyphomycetes and allied species. Additional sequences were obtained from GenBank and a conspectus of the evolution of the predatory orbiliaceous fungi is provided. The predatory taxa are found to have evolved from within the genus Orbilia. The major monophyletic clades are: species possessing constricting rings (group I) and species with various adhesive trapping devices. The latter clade can be subdivided into at least three monophyletic groups, corresponding to species with adh. networks (group II), adh. columns or unstalked adh. knobs (group III), and stalked adh. knobs (group IV). Species with non-constricting rings are a terminal development within group IV. No secondary loss of predacity could be detected. Taxonomic rearrangements and a new generic concept will be published soon.

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