ISSN:0040-0262    

DOI:10.2307/1218596

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryFine structure studies on 46 species from 26 families of Magnoliidae and Ranunculidae enabled a classification of their sieve‐tube plastids into P‐type or S‐type. In accordance with many other dicotyledons, most of the species (31) develop S‐type plastids that accumulate starch. 15 species (all from Magnoliidae) contain P‐type plastids that have protein inclusions (exclusively, or besides starch grains). Among the latter are all investigated species from Annonaceae‐Canellaceae‐Myristicaceae‐Aristolochiaceae. Since earlier phytochemical studies revealed affinities between these families, the formation of P‐type plastids confirms the connection between these families and the position of the Aristolochiaceae in the Magnoliidae.

ISSN:0040-0262    

DOI:10.2307/1218597

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummarySieve tubes of Caryophyllales (35 species from 12 families investigated) contain specific plastids that are characterized by peripherally lying ring‐shaped bundles of proteinaceous filaments and often an additional core. In most of the families the presence of a peculiar plastid in sieve tubes coincides with the formation of betacyanins and betaxanthins, typically restricted to Caryophyllales, but there are some exceptions: Molluginaceae and Caryophyllaceae have the specific plastids but lack the special plant‐pigments;Batis, often put next to the Chenopodiaceae, has neither of them. The taxonomic value of both sieve‐tube plastids and plant pigments with special reference to Bataceae is discussed. Finally, these data are used to suggest a restructuring of the subclass Caryophyllidae.

ISSN:0040-0262    

DOI:10.2307/1218598

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryThe pollen of all species ofClarkia(Onagraceae) has been investigated by light and scanning electron microscopy. Fifteen characters were scored and analysed by numerical taxonomic methods. The resulting dendrogram successfully separates several of the natural groups withinClarkia. The limitations of interpreting phylogenetic status of characters despite the availability of a well‐documented phylogeny of the species are discussed.

ISSN:0040-0262    

DOI:10.2307/1218599

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryOn the basis of many similarities in taxonomical characters the genera Eranthis and Helleborus are combined in the subtribe Helleborinae, Ranunculaceae. Former investigations in comparative serology indicated, that this close relationship can be dubious. This work confirms earlier findings: in serological characters Eranthis is more similar to Actaea/Cimicifuga than to Helleborus. Although Helleborus itself seems to have much in common with Eranthis, it shows unexpected strong similarities with achene‐fruited or annual members of the Ranunculaceae (Myosurus, Adonis, Consolida) too. These results cannot be caused by undifferentiated embryos in mature seeds of Eranthis. Even fully developed embryos show the same antigenic pattern until the beginning of germination. An overall revision of the subtribe Helleborinae is suggested.

ISSN:0040-0262    

DOI:10.2307/1218600

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummaryHyphal morphology has been used by various authors to define sooty mold Ascomycete taxa and to establish pleomorphic relationships between sexually and asexually reproducing species occurring together in a naturally developed colony. Evidence is presented to indicate that the presence of hyphal ornamentation is an unreliable taxonomic character. Reports in the literature of pleomorphic relationships based on culture work are reviewed. It is concluded that experimental evidence must be obtained to support taxonomic use of hyphal morphology data taken from sooty mold colonies developed in Nature.

ISSN:0040-0262    

DOI:10.2307/1218601

出版商:Wiley    

年代:2019

数据来源: WILEY

摘要:

SummarySummit Garden in the Panama Canal Zone has been important for its contributions to research in plant introduction and utilization, horticulture and general botanical science. Many famous men of botany have been contributors to its endeavors. Botanical research waned following the war when the Garden became essentially a beautiful public park. With the establishment of Summit Herbarium&Library this year, scientific research is again active at the Garden.

ISSN:0040-0262    

DOI:10.2307/1218602

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.2307/1218603

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.1002/j.1996-8175.1971.tb03207.x

出版商:Wiley    

年代:2019

数据来源: WILEY

ISSN:0040-0262    

DOI:10.1002/j.1996-8175.1971.tb03208.x

出版商:Wiley    

年代:2019

数据来源: WILEY