摘要:

The author considers whether there is any advantage to be gained in eliminating the use of nomenclatural type for spore genera, as already proposed by among others Gunnar Erdtman in 1947. In the author's Synopsis the ‘turmae’, as well as taxa above familial rank in the “natural system” of Engler and Prantl have no type. Type abolition is not advocated in the case of form species of spores. The references at the end (Potonié, R., 1931–1973) illustrate the author's changing view-point in taxonomical treatment of the Sporae dispersae over the years elapsed since the proposals of Henry Potonié in 1909, before finally adopting the type method of the ICBN.

ISSN:0017-3134    

DOI:10.1080/00173137309429879

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

A new genus of striate saccate pollen,Caelopollisis described from the Virgilian (Pennsylvanian) of Kansas. A striate distal leptoma serves to distinguish the genus and four new species of striate pollen. One new species ofVittatina, V. moorei,is described that also possesses an unusual type of distal ornamentation.

ISSN:0017-3134    

DOI:10.1080/00173137309429880

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Some earlier published data are reconsidered and a case is made for the basic climatic relationship of the phenomenon, rather than the anthropogenic or continuous plant migration viewpoints. Possible implications are discussed.

ISSN:0017-3134    

DOI:10.1080/00173137309429881

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The common mode of angiosperm pollen ontogeny, as exemplified inCampanula persicifolia, C. rotundifoliaandC. rapunculoides,is reviewed. A comparison is made with that seen inEleocharis(Cyperaceae), in which the tetrad generally gives rise to a single viable pollen grain, the remaining cells degenerating. The intracellular distribution of, and fine structural changes in the various organelles are related to the morphogenetic stages of pollen wall formation, viz. the callose, primexine template and probacula (the first exine). The tissue surrounding the pollen is briefly described.

ISSN:0017-3134    

DOI:10.1080/00173137309429882

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The ultrastructure of meiotic cells and ascospores of the ascomyceteOphiostoma multiannulatumhas been examined. The young asci contain nuclei, mitochondria and endoplasmic reticulum and the ripe asci are rich in lipid droplets. Thin filaments have been observed in the mitochondria, they probably consist of DNA. The ascospores are uninucleate and surrounded by a thin cell wall.

ISSN:0017-3134    

DOI:10.1080/00173137309429883

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The pollen morphology of two species ofDroserahas been investigated by means of both light and electron microscopy. The apertures are situated proximally, a state rarely found in the pollen of Angiospermous plants. The pollen morphology ofAldrovanda, DioneaandDrosophyllumis compared.

ISSN:0017-3134    

DOI:10.1080/00173137309429884

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Morphological data are presented on the pollen ofLimnocharis flavaBuch.,Hydrocleis nymphoides(Willd.) Buch., andTenagocharis latifolia(Don) Buch. These data suggest that the structure of the germinal aperture is taxonomically more pertinent in the Limnocharitaceae than the structure of the interporal exine and indicate some similarities in pollen morphology and fine structure between particular taxa in the Limnocharitaceae and Alismataceae.

ISSN:0017-3134    

DOI:10.1080/00173137309429885

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

A positive [MATTER UNCLEAR IN PDF FILE]atalase reaction, using a modification of the Graham & [MATTER UNCLEAR IN PDF FILE]arnovsky method, was obtained from the microbodies of [MATTER UNCLEAR IN PDF FILE]pore cells at both developmental stages, as well as from [MATTER UNCLEAR IN PDF FILE]it-membrane-bounded outgrowths from the chloroplasts. The outgrowths showed other morphological similarities with microbodies. This cytochemical finding supports our [MATTER UNCLEAR IN PDF FILE]revious opinion that microbodies may bud off from the [MATTER UNCLEAR IN PDF FILE]hloroplasts, as well as developing from the endoplasmic [MATTER UNCLEAR IN PDF FILE]eticulum. A positive catalase reaction was obtained only within the cell cytoplasm. Other peroxidases are present within the cell wall matrix however.

ISSN:0017-3134    

DOI:10.1080/00173137309429886

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Altogether 100 specimens of 16 species of this highly diversified genus have been studied. Pollen morphology has been found useful in the grouping of the species, but of no use for distinguishing between species within the same group. The three earlier established pollen-types, theCrassiuscula-,Kilimandscharica-andVolkensii-types, have been confirmed. The inter- and intraspecific variation in theCrassiuscula-type, is mainly in sexine thickness, shape of bacula and processes. In the other two types, the variation is mainly in sexine pattern, shape and width of lirae. The three pollen-types are illustrated with scanning electron micrographs (SEMG) and transmission electron micrographs (TEMG).

ISSN:0017-3134    

DOI:10.1080/00173137309429887

出版商:Taylor & Francis Group    

年代:1973

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:10.1080/00173137309429878

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor