Document Detail

Evidence of apothecial ancestry in the cleistothecial ascomata of Pleuroascus nicholsonii.
MedLine Citation:
PMID:  18951006     Owner:  NLM     Status:  MEDLINE    
Ascomata of Pleuroascus nicholsonii, a rarely reported cleistothecial ascomycete, show little overt evidence of a putative affiliation with the Leotiomycetes. However, close examination of the plectomycetous centrum reveals a distorted hymenium arising from a system of branched ascogenous hyphae, and twisted or coiled uniseriate ascospores enclosed within what appears to be the remains of the spore investing membrane of a clavate ascus precursor. Abundant sterile elements arising from the inner wall layer of the peridium and interspersed throughout the centrum are interpreted as representing vestiges of apically branched paraphyses. Whole ascomata show limited signs of polarity, although the characteristic, tightly coiled appendages generally arise along or below the equatorial region and there is a marked thinning of subicular hyphae over the crown of the cleistothecium. The mature peridium, which consists of a thin, melanized outer layer of squamulose cells, splits irregularly along intercellular grooves when disturbed. The adaptive significance of these characteristics is unknown, but the persistent paraphyses, the easily fractured and darkly pigmented membranous peridium, an ascospore mass that is dry at maturity, and the tendency for ascomata to cling together in clumps can be rationalized in the context of a coprophilous life-style. Collection data for P. nicholsonii provide further support for this supposition because five of the six reported specimens are from rodent dung.
Marcie J R Plishka; Akihiko Tsuneda; Randolph S Currah
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-05-18
Journal Detail:
Title:  Mycological research     Volume:  112     ISSN:  0953-7562     ISO Abbreviation:  Mycol. Res.     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-11-10     Completed Date:  2009-01-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8913481     Medline TA:  Mycol Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  1319-26     Citation Subset:  IM    
Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada.
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MeSH Terms
Ascomycota / ultrastructure*
Hyphae / ultrastructure
Microscopy, Electron, Transmission
Spores, Fungal / ultrastructure*

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