Taxonomy and spore morphology of selected taxa of Cheilanthoideae and Pteridoideae (Pteridaceae) from Pakistan

Over the past decade much progress has been made in an effort to determine which fungi are mycorrhizal symbionts. It is now apparent that one ectomycorrhizal or ectendomycorrhizal host is often able to form mycorrhizae with a wide variety of higher fungi. Evidence is presented which supports the hypothesis that fungal succession occurs as the host matures. In addition, fungi which are normally ectomycorrhizal may sometimes form endomycorrhizae on different hosts or under altered ecological conditions. There has also been much evolution in fruiting-body form and mode of spore discharge especially under severe montane or desert conditions. As a result patterns are emerging in the Homobasidiomycetes at the order, family, and generic level in the evolution of the mycorrhizal habit. Spore morphology, habitat, and distribution are listed and discussed in relation to the biological role of the fungi.

Download Full-text

Observations of spore morphology of some hepatic species (Marchantiophyta) in China

Arctoa ◽

10.15298/arctoa.20.16 ◽

2011 ◽

Vol 20 (1) ◽

pp. 205-210 ◽

Cited By ~ 4

Author(s):

Dong-Ping Zhao ◽

Xue-Liang Bai ◽

Li-Hong Wang

Keyword(s):

Spore Morphology

Download Full-text

Leptosphaeria hispanica, a new species of the Dothideales, Ascomycotina

Canadian Journal of Botany ◽

10.1139/b87-287 ◽

1987 ◽

Vol 65 (10) ◽

pp. 2096-2097

Author(s):

J. Checa ◽

G. Moreno

Keyword(s):

New Species ◽

Spore Morphology ◽

A New Species

The authors propose a new species, Leptosphaeria hispanica, characterized by its spore morphology. The most interesting microscopical characters are illustrated photographically.

Download Full-text

Spore morphology and taxonomy of Isoetes in northeastern North America

Canadian Journal of Botany ◽

10.1139/b83-353 ◽

1983 ◽

Vol 61 (12) ◽

pp. 3140-3163 ◽

Cited By ~ 36

Author(s):

L. Kott ◽

D. M. Britton

Keyword(s):

North America ◽

Spore Morphology ◽

Key To Species ◽

Northeastern North America ◽

Spore Size ◽

Distribution Maps

Taxonomy of Isoetes L. largely rests on megaspore and microspore wall ornamentation and spore size. These characters have been reevaluated and the range of their variability is described (SEM photographs). Eight species of Isoetes are recognized for northeastern North America: I. macrospora, I. hieroglyphica, I. tuckermanii, I. riparia, I. acadiensis, I. echinospora, I. eatonii, and I. engelmannii. Each species is provided with a revised list of synonyms, description, ecological notes, representative specimens, and distribution maps. A key to species is provided.

Download Full-text

Evolution of Spore Morphology in the Blechnaceae

International Journal of Plant Sciences ◽

10.1086/699798 ◽

2018 ◽

Vol 179 (9) ◽

pp. 712-729 ◽

Cited By ~ 6

Author(s):

Robbin C. Moran ◽

Judith G. Hanks ◽

Paulo H. Labiak

Keyword(s):

Spore Morphology

Download Full-text

Palynological analysis of Dennstaedtiaceae taxa from the Paranaense Phytogeographic Province that produce Trilete spores II: Microlepia speluncae and Pteridium arachnoideum

Anais da Academia Brasileira de Ciências ◽

10.1590/0001-3765201620150230 ◽

2016 ◽

Vol 88 (2) ◽

pp. 877-890 ◽

Cited By ~ 1

Author(s):

Agustina Yañez ◽

Gonzalo J. Marquez ◽

Marta A. Morbelli

Keyword(s):

Comparative Analysis ◽

Three Dimensional ◽

Middle Layer ◽

The Other ◽

Spore Morphology ◽

Central Channel ◽

Palynological Analysis ◽

Dimensional Network ◽

The Family ◽

Wall Ultrastructure

The spore morphology and wall ultrastructure of Microlepia speluncae and Pteridium arachnoideum from the Paranaense Province were analyzed with LM, SEM and TEM and a comparative analysis was carried out. In both species the spores are covered by a three-dimensional network of threads branched and fused, tangentially arranged to the surface, and some free-end threads are also seen. The species were differentiated by morphology and the frequency of threads fusion and the networks distribution on the surface of the spores. In both species the exospore is two-layered in section, both layers are traversed by single or branched channels. The perispore is three-layered in section: the inner layer is adhered to the exospore, the middle layer is formed of a three-dimensional network of threads and the outer layer is discontinuous. The perispore ultrastructure of Microlepia speluncae was interpreted as formed of helical subunits displayed around a central channel. The spore morphology and perispore ultrastructure allow differentiating Microlepia from Pteridium but also to the other Dennstaedtiaceae genera that grow in the Paranaense Province. The results obtained allow establishing relationships that let us recognize different groups and gave a new reference to get a better knowledge of the family.

Download Full-text