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Abstract
Geosiphon pyriformis(Kütz.) v. Wettstein is the only known example of a fungus living in endocytobiotic association with a cyanobacterium. The close phylogenetic relationship ofGeosiphonwith some arbuscular mycorrhizal fungi (AMF) and the phylogenetic position ofGeosiphonare shown in detail. Comprehensive small subunit (SSU) rRNA sequence analyses allow the erection of a new, molecular phylogeny-based taxonomic system for the AMF, includingGeosiphon (Geosiphonaceae). Within the recently described phylum Glomeromycota (with one class, Glomeromycetes), a system including four orders was proposed. The erection of several new families will also be necessary. Evolutionary implications are discussed, referring to different possibilities of the influence of AMF on the colonization of the terrestrial habitat by plants.
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Institut für Botanik, FB10, Technische Universität Darmstadt, Schnittspahnstrasse 10, D-64287, Darmstadt, Germany
Arthur Schüßler
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Schüßler, A. Molecular phylogeny, taxonomy, and evolution ofGeosiphon pyriformis and arbuscular mycorrhizal fungi.Plant and Soil244, 75–83 (2002). https://doi.org/10.1023/A:1020238728910
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