On the Function and Structure of the Septal Pore of Polyporus rugulosus

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Abstract
Micrographs of serial sections of Polyporus rugulosus Lev. show minute and regularly spaced pore-cap perforations which are of similar dimensions to nuclear membrane pores. The presence of two types of pore apparatus in Basidiomycetes is established, and suggestions are made about the function and evolutionary development of the septal pores of Basidiomycetes.