Portal de Periódicos da CAPES

Fine Structure of Mycota. 7. Observations on Septa of Ascomycetes and Basidiomycetes

1962; Wiley; Volume: 49; Issue: 1 Linguagem: Inglês

10.2307/2439393

1537-2197

Royall T. Moore, James H. McAlear,

Fungal Biology and Applications

American Journal of BotanyVolume 49, Issue 1 p. 86-94 Article FINE STRUCTURE OF MYCOTA. 7. OBSERVATIONS ON SEPTA OF ASCOMYCETES AND BASIDIOMYCETES Royall T. Moore, Royall T. Moore Department of Plant Pathology, Cornell University, Ithaca, New York Division of Laboratories and Research, New York State Department of Health, Albany, New YorkPresent address: Electron Microscope Laboratory, University of California, Berkeley.Search for more papers by this authorJames H. McAlear, James H. McAlear Department of Plant Pathology, Cornell University, Ithaca, New York Division of Laboratories and Research, New York State Department of Health, Albany, New YorkPresent address: Electron Microscope Laboratory, University of California, Berkeley.Search for more papers by this author Royall T. Moore, Royall T. Moore Department of Plant Pathology, Cornell University, Ithaca, New York Division of Laboratories and Research, New York State Department of Health, Albany, New YorkPresent address: Electron Microscope Laboratory, University of California, Berkeley.Search for more papers by this authorJames H. McAlear, James H. McAlear Department of Plant Pathology, Cornell University, Ithaca, New York Division of Laboratories and Research, New York State Department of Health, Albany, New YorkPresent address: Electron Microscope Laboratory, University of California, Berkeley.Search for more papers by this author First published: 01 January 1962 https://doi.org/10.1002/j.1537-2197.1962.tb11750.xCitations: 77 AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Moore, R. T., and J. H. McAlear. (Cornell U., Ithaca, N. Y.) Fine structure of mycota. 7. Observations on septa of Ascomycetes and Basidiomycetes. Amer. Jour. Bot. 49(1): 86–94. Illus. 1962.—Electron microscopy of 13 carpomycete species (5 Ascomycetes, 5 Basidiomycetes, and 3 Deuteromycetes) presents evidence that suggests there is an Ascomycete- and a Basidiomycete-type septum. The observed Ascomycete septa taper slightly or not at all toward a simple, clear-channel, central pore, while the observed Basidiomycete septa flare sharply and broadly at the center to produce what is termed a dolipore septum. On each side of this septum is a double membrane structure that is crescent-shaped in section. This is given the name parenthesome. These dolipore-parenthesome septa were found to be characteristic of basidiocarpic, dikaryotic, hyphae. Interpretative drawings of both types of septa are presented. From these and the micrographs, it is not difficult to see how materials, including nuclei, could pass through the Ascomycete-type septum, but it would appear that the modifications of the Basidiomycete-type septum while maintaining cytoplasmic continuity would prohibit nuclear migration in dikaryotic hyphae. It is postulated that as the plant and animal phylogenetic lines have developed actual diploidism, the terminal group of the fungi may have achieved functional diploidism. Of the 3 species of Deuteromycetes examined, 2, Aspergillus variecolor and Stilbum zacalloxanthum, have typical Ascomycete-type septa; the third, QM 7739, has Basidiomycete-type septa. This fungus is a species of Sclerotium, but the present confusion and lack of definitive information regarding the taxonomy, genetics, and perfect stage of this genus prohibit the enlarging at present on the possible significance of this observation. Citing Literature Volume49, Issue1January 1962Pages 86-94 RelatedInformation