The Lecanoralean Ascus: An Ultrastructural Preliminary Study

Bellemere, A.; Letrouit-Galinou, M.-A.

doi:10.1007/978-1-4612-5844-5_5

Cited by 18 publications

(3 citation statements)

References 7 publications

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“…type', etc.) was proposed by Bellemere & Letrouit-Galinou (1981). It is, however, doubtful whether such a complex terminology, which is based on ultrastructural details of partly poorly preserved material, will serve all those mycologists and lichenologists who are working within the resolution limits of the light microscope.…”

Section: Discussionmentioning

confidence: 99%

The Ascus Apex in Lichenized Fungi IV. Baeomyces and Icmadophila in Comparison with Cladonia (Lecanorales) and the Non-Lichenized Leotia (Helotiales)

Honegger

1983

The Lichenologist

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This comparative investigation on ascus fine structure and function substantiates the findings of Chadefaud (1960) and his coworkers indicating a close taxonomic relationship between the Baeomycetaceae and Leotia, a non-lichenized member of the Helotiales, rather than between the Baeomycetaceae and the Cladoniaceae and other members of the Lecanorales. Besides the distinct differences in ascus structure and function, cytological divergences were noted between the Baeomycetaceae and Leotia on one hand, and Cladoniaceae on the other. The occurrence of glycogen in the Baeomycetaceae and Leotia, but not in the Cladoniaceae and other members of the Lecanorineae, and the differences in phycobiont preference and thus in the mycobiont-phycobiont contact in the Baeomycetaceae and Cladoniaceae were discussed.

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Section: Discussionmentioning

confidence: 99%

The Ascus Apex in Lichenized Fungi IV. Baeomyces and Icmadophila in Comparison with Cladonia (Lecanorales) and the Non-Lichenized Leotia (Helotiales)

Honegger

1983

The Lichenologist

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“…In addition to the growth form, considerable focus has been paid to the nature of the cortex and pseudocyphellae, position and structure of the apothecia, shape and size of the ascospores, pycnidial and conidial characters, chemical compounds, biogeography and ecology. The appearance of the asci has been considered of particular importance in lichen taxonomy (Bellemère and Letrouit‐Galinou 1981, Hafellner 1984, Kärnefelt et al 1992, Thell et al 1995a). However, when it became possible to perform phylogenetic analyses based on DNA‐sequences in the late 1990s, it was evident that the conidial shape was the morphological character that correlated best with molecular phylogenetic reconstructions (Thell et al 2004).…”

Section: Morphology Chemistry and Distributionmentioning

confidence: 99%

A review of the lichen family Parmeliaceae – history, phylogeny and current taxonomy

Thell

Crespo

Divakar

et al. 2012

Nordic Journal of Botany

121

117

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The largest family of lichen‐forming fungi, the Parmeliaceae, is reviewed. It includes 79 genera in current use and ca 2726 species, a large majority of which belong to one of five main clades: the parmelioid, cetrarioid, usneoid, alectorioid and hypogymnioid. However, 21 genera are positioned outside these clades, and four genera in current use still lack DNA‐ data. The family has been shown to be monophyletic and the generic classification is relatively well‐settled compared with other lecanoralean families. Each clade and its genera are presented here with the latest results from phylogenetic analyses and current taxonomy. In addition, a historical outline of the family and its most prominent researchers is provided.

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“…The significance of ascus structure and function as a diagnostic feature for the natural classification of lichenized and non-lichenized ascomycetes has been demonstrated and discussed by various mycologists and lichenologists (Luttrell 1951, Chadefaud 1973, Letrouit-Galinou 1973, Beckett 1981, Bellemere & Letrouit-Galinou 1981, Honegger 1982.…”

Section: Introductionmentioning

confidence: 99%

The Ascus Apex in Lichenized Fungi III. The Pertusaria-Type

Honegger

1982

The Lichenologist

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On the basis of light microscopic (LM), scanning electron microscopic (SEM) and transmission electron microscopic (TEM) investigations the Pertusaria-type of ascus is described as a particular functional type. The functionally unitunicate Pertusaria-type is characterized by its structure, staining properties, and by its particular mode of dehiscence. Tripartite ascus walls were observed in LM and TEM. The non-amyloid ascus wall is surrounded by a thin, amyloid outer layer. Both become amorphous at maturity and partly disintegrate. An apically thickened, amyloid inner layer reaches the base of the ascus. In its fine structure this amyloid inner layer resembles the material of the amyloid dome of Lecanora-type asci. It plays an important role during dehiscence and spore discharge. An elongation process was observed prior to dehiscence, at the end of which the ascus tip is situated above the hymenial surface. Dehiscence occurs by bursting or splitting of the whole ascus tip. The Pertusaria-type might represent a side-branch of evolution from bitunicate to unitunicate forms within the Lecanorales.Pertusaria-type asci are restricted to a small number of genera within the Pertusariaceae. A considerable heterogeneity in ascus structure and staining properties was observed within the Pertusariineae sensu Henssen & Jahns (1973) and Henssen (1976).

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The Lecanoralean Ascus: An Ultrastructural Preliminary Study

Cited by 18 publications

References 7 publications

The Ascus Apex in Lichenized Fungi IV. Baeomyces and Icmadophila in Comparison with Cladonia (Lecanorales) and the Non-Lichenized Leotia (Helotiales)

The Ascus Apex in Lichenized Fungi IV. Baeomyces and Icmadophila in Comparison with Cladonia (Lecanorales) and the Non-Lichenized Leotia (Helotiales)

A review of the lichen family Parmeliaceae – history, phylogeny and current taxonomy

The Ascus Apex in Lichenized Fungi III. The Pertusaria-Type

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