Header

UZH-Logo

Maintenance Infos

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


Honegger, Rosmarie (1982). The Ascus Apex in Lichenized Fungi III. The Pertusaria-Type. The Lichenologist, 14(3):205-217.

Abstract

On the basis of light microscopic (LM), scanning electron microscopic (SEM) and transmission electron microscopic (TEM) investigations the <jats:italic>Pertusaria</jats:italic>-type of ascus is described as a particular functional type. The functionally unitunicate <jats:italic>Pertusaria</jats:italic>-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 <jats:italic>Lecanora</jats:italic>-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 <jats:italic>Pertusaria</jats:italic>-type might represent a side-branch of evolution from bitunicate to unitunicate forms within the Lecanorales.<jats:italic>Pertusaria</jats:italic>-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 &amp;amp; Jahns (1973) and Henssen (1976).

Abstract

On the basis of light microscopic (LM), scanning electron microscopic (SEM) and transmission electron microscopic (TEM) investigations the <jats:italic>Pertusaria</jats:italic>-type of ascus is described as a particular functional type. The functionally unitunicate <jats:italic>Pertusaria</jats:italic>-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 <jats:italic>Lecanora</jats:italic>-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 <jats:italic>Pertusaria</jats:italic>-type might represent a side-branch of evolution from bitunicate to unitunicate forms within the Lecanorales.<jats:italic>Pertusaria</jats:italic>-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 &amp;amp; Jahns (1973) and Henssen (1976).

Statistics

Citations

Dimensions.ai Metrics
18 citations in Web of Science®
14 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

27 downloads since deposited on 25 Oct 2018
9 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:National licences > 142-005
Dewey Decimal Classification:Unspecified
Scopus Subject Areas:Life Sciences > Ecology, Evolution, Behavior and Systematics
Language:English
Date:1 October 1982
Deposited On:25 Oct 2018 16:53
Last Modified:15 Apr 2021 14:49
Publisher:Cambridge University Press
ISSN:0024-2829
OA Status:Green
Publisher DOI:https://doi.org/10.1017/s0024282982000437

Download

Green Open Access

Download PDF  'The Ascus Apex in Lichenized Fungi III. The Pertusaria-Type'.
Preview
Content: Published Version
Language: English
Filetype: PDF (Nationallizenz 142-005)
Size: 1MB
View at publisher