摘要:

Descriptions are provided of typical tetrahedral, and atypical bilateral (monolete) and intermediate spore types, from cultivated specimens ofPteris longifoliaL. The taxonomic implication are discussed.

ISSN:0017-3134    

DOI:10.1080/00173137409434766

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

Two new pollen genera,ElongatosaccitesandConipollenites, a new spore species,Kyrtomisporis corrugatus,and specimens ofVesicaspora schemeliare illustrated and described from well core and cutting samples of Upper Triassic age from the Arabian Peninsula and the adjacent Arabian Gulf.

ISSN:0017-3134    

DOI:10.1080/00173137409434767

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

Pollen ofZygogynum balansaeandZ. pomiferumis described with the aid of the scanning electron microscope. Other members of the primitive ranalean family Winteraceae hitherto investigated have pollen in permanent tetrads, but these two species have solitary grains. Sculpturing is similar on the distal and proximal faces of each grain, excluding the distal apertural zone. The exine pattern resembles that on distal faces of tetrads of otherZygogynumspecies investigated, includingZ. bailloni, the pollen of which is illustrated. AlthoughZygogynumandExospermumhave rather similar pollen, with sculpturing differing from other Winteraceae in consisting of a less coarse reticulum, pollen ofExospermum stipitatumis clearly distinct from theZygogynumspecies investigated, as seen in the scanning electron microscope. It is not clear whether or not the solitary pollen type has evolved from the tetrad form.

ISSN:0017-3134    

DOI:10.1080/00173137409434768

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

The study deals with the role of the rough endoplasmic reticulum in the pollen mother cells ofBerberis vulgarisfrom telophase I to the tetrad stage of meiosis. At the time of cell plate formation, among the various vesicles and vacuoles concerned derived from Golgi structures and containing callose material, globules of an electron-dense and amorphous material appear in the area of the cell plate. Initially such globules are associated with short cisternae of rough endoplasmic reticulum, which have a characteristic electronopaque content. As the formation of the cell plate progresses, analogous globules become deposited on the surface of the newly formed plasmalemma as well as on the plasmalemma surrounding the pollen mother, cell. It would appear that these deposits of electron-dense and amorphous material, so abundant at the tetrad stage represent the exine material of the pollen grain wall.

ISSN:0017-3134    

DOI:10.1080/00173137409434769

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

Acetolyzed and non-acetolyzed pollen grains ofCarexwere subject to vacuum, excess pressure and Anderson Critical Point Apparatus before examination in the scanning electron microscope. The best results were achieved with the latter equipment.

ISSN:0017-3134    

DOI:10.1080/00173137409434770

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

The pollen morphology of seven species of Guayana genera is described and a series of photomicrographs and SEM micrographs are presented to illustrate the eurypalynous quality of the family.

ISSN:0017-3134    

DOI:10.1080/00173137409434771

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

ISSN:0017-3134    

DOI:10.1080/00173137409434772

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

ISSN:0017-3134    

DOI:10.1080/00173137409434774

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue

ISSN:0017-3134    

DOI:10.1080/00173137409434765

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor