Marius Chadefaud et les Asques: données inédites Études ultrastructurales complémentaires

Bellemere, A.; Janex-Favre, M. C.; Farguey-Leduc, A.

doi:10.1080/01811797.1987.10824749

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…Based on his TEM studies of several members of the Helotiales, Bellemère (1977) suggested that the ascus apical apparatus of these fungi contained two rings, an outer ring ('anneau supérieur') composed of c-layer material of the ascus wall, and an inner ring ('anneau inférieur') composed of dlayer material. Bellemère et al (1987), however, no longer insisted on the linkage of these layers and rings. According to Baral (1987b), the annulus of Helotiales consists of three separate rings, which correspond with three layers of the ascus wall.…”

Section: The Structure Of the Ascus Wall And Apical Apparatusmentioning

confidence: 99%

“…: Fr., but he did not present micrographs for these species. The ultrastructure of the relatively small, amyloid apical apparatus of T. strobilicola (Bellemère et al 1987) differs considerably from that of O. hemiamyloidea, and also from Bulgaria inquinans (Bellemère 1977, Verkley 1992. Baral (1999) suggested that O. hemiamyloidea might be closely related to Belonopsis (Sacc.)…”

Section: The Taxonomic Position Of Ombrophila Hemiamyloideamentioning

confidence: 99%

“…Few have been revised or studied in culture, and molecular phylogenetic data for certain groups have only recently become available (Collado et al 2002, Gernandt et al 2001, Verkley 1999, Abeln et al 2000, Crous et al 2003. The taxonomy of the inoperculate discomycetes is far from settled, and mycologists have used light microscopy to study ascal morphology with refined methods as a possible source of useful characters (Chadefaud 1964, 1973, Baral 1987b, Triebel & Baral 1996 and with TEM (Bellemère 1975, 1977, Bellemère et al 1987, Verkley 1992, 1993aand b, 1994, 1995aand b, 1996, Lenurm & Raitviir 2000). These studies have revealed a large diversity in structure and function of the ascus apical apparatus in the Helotiales.…”

Section: Introductionmentioning

confidence: 99%

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Ultrastructure of the ascus apical apparatus and ascospore wall in Ombrophila hemiamyloidea (Helotiales, Ascomycota)

Verkley¹

2002

nova_hedwigia

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The ultrastructure of the ascus apical apparatus, lateral ascus wall and ascospore wall of Ombrophila hemiamyloidea was studied with TEM. The apical apparatus is composed of a well-developed apical thickening that surrounds an apical chamber and is fully occupied by a broad annulus. This annulus initially consists of a homogeneous matrix, but, due to changes in ultrastructure and PATCH -SP reactivity, two annular subregions become distinguishable as the ascus matures. These features do not correlate with the hemiamyloid properties of the annulus in Lugol's iodine solution, which imparts a distinct and homogeneous red colour to both of these subregions in mature asci. After dehiscence, the annulus is everted over an angle of about 90°. The mature ascospore wall is composed of an endospore covered by an epispore. The endospore is lined by an inner wall layer which is continuous with the septal walls. Comparison with ultrastructure of the ascus and ascospores of Ombrophila violacea, the type species of the genus Ombrophila, indicates that O. hemiamyloidea does not belong in this genus. The general morphology of the apical apparatus and the structure and reactivity of the annulus agree with the Pezicula ascus type. The results indicate that O. hemiamyloidea is more closely related to Pezicula and related genera of the family Dermateaceae than to the Vibrisseaceae or the Mollisiaceae as previously been suggested.

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Section: The Structure Of the Ascus Wall And Apical Apparatusmentioning

confidence: 99%

Section: The Taxonomic Position Of Ombrophila Hemiamyloideamentioning

confidence: 99%