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Mycologia, 96(5), 2004, pp. 1136-1142.
© 2004 by The Mycological Society of America

Endoconidiogenesis in Endoconidioma populi and Phaeotheca fissurella


A. Tsuneda 1

     Department of Biological Sciences, University of Alberta, Edmonton, Alberta, T6G 2E9

I. Tsuneda

     Medicine/Dentistry Electron Microscopy Unit, University of Alberta, Edmonton, Alberta, T6G 2N8

R. S. Currah

     Department of Biological Sciences, University of Alberta, Edmonton, Alberta, T6G 2E9

Details of the development of endoconidia were basically the same in Endoconidioma populi and Phaeotheca fissurella. In both species, endoconidiogenesis involved (i) subdivision of conidiogenous mother cells by septation to form two to several daughter cells; (ii) accumulation of an electron-dense material between the daughter and mother cell walls; and (iii) separation of the daughter cells by septum schizolysis, accompanied by the dissolution of mother cell wall. Conidiomata of E. populi were unique in having a closed peridium and a locule filled with conidiogenous mother cells and, therefore, we proposed the new term, cleistopycnidium (pl. -a), for this structure. In the cleistopycnidium of E. populi, endoconidiation usually began in the core of the locule and spread outward. Release of endoconidia was by the degeneration of peridial cell walls.

Key words: black yeasts, cleistopycnidium, conidioma, endoconidium, meristematic black fungi, septum schizolysis, ultrastructure




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A. Tsuneda, S. Hambleton, and R.S. Currah
Morphology and phylogenetic placement of Endoconidioma, a new endoconidial genus from trembling aspen
Mycologia, September 1, 2004; 96(5): 1128 - 1135.
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Copyright © 2004 by The Mycological Society of America.