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Septal pore apparatus and nuclear division of Auriscalpium vulgare

     Department of Plant Biology, University of Minnesota, Saint Paul, Minnesota 55108

Kelly A. Josephsen

     Imaging Center, College of Biological Sciences, University of Minnesota, Saint Paul, Minnesota 55108

Thomas S. Jenkinson
Esther G. McLaughlin
David J. McLaughlin

     Department of Plant Biology, University of Minnesota, Saint Paul, Minnesota 55108

Ultrastructure of the septal pore apparatus and nuclear division of Auriscalpium vulgare (Russulales) was examined with freeze substitution and is presented for inclusion in the AFTOL Structural and Biochemical Database (http://aftol.umn.edu). Previously unreported septal characters for the Russulales (Agaricomycotina) were observed: Septa of the hymenophore had bell-shaped perforated septal pore caps that may extend along the septum and a zone of organelle exclusion surrounded the septal pore apparatus. Metaphase I of meiosis and metaphase of mitosis were similar. Globular spindle pole bodies with electron-opaque inclusions were set within polar fenestrae of the nuclear envelope. The nuclear envelope was mostly intact with occasional gaps. Fragments of endoplasmic reticulum were present near the spindle pole bodies but did not form a polar cap. Structural characters may distinguish one or more clades of the Agaricomycotina and provide additional signal in phylogenetic analyses.

Key words: basidiocarp, basidium, cytology, informatics, phylogeny, sporocarp