摘要:

SUMMARYAs a part of a broader biosystematic analysis of the NW‐European species of theCarex flavacomplex a comparative study was made of the flowering ofC. flava, C. lepidocarpa, C. demissaand the subspeciesserotinaandpulchellaofC. serotina. In these taxa the inflorescence develops in the same way, except the apical male spike, which inC. flavastarts anthesis in its lower portion, but in all other species in the distal portion during the principal flowering period and at the other end during protracted flowering. The inflorescence is protogynous. A male spike contains florets in anthesis for several days, each individual floret coming in anthesis for one day only and producing pollen during the morning. A female floret may be in anthesis for several days. The development of the spikes in an inflorescence proceeds basipetally, but anthesis in a female spike proceeds acropetally. The development of inflorescences with an anomalous distribution of the sexes, and the flowering phenomena characteristic of hybrids are discussed separately. The flowering periods of the taxa coincide to an appreciable extent, so that hybridisation is likely to occur.Protracted or second flowering has only been observed inC. demissaandC. serotina. OnlyC. serotinacomes into flower in the first growing season. The differences between its phenology and that of the other species may be attributable to its specific habitat. All species are anemophilous and exhibit both autogamy and outbreedin

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1979.tb01153.x

年代:1979

数据来源: WILEY

摘要:

SUMMARYThe present paper deals with the wood anatomy of the Blakeeae (Melastomataceae). Generic descriptions of the secondary xylem ofBlakea, Topobea, andHuilaeaare given and compared with data on 16 genera of the Miconieae. Numerical pattern detection was undertaken. The results confirm our preliminary ideas thatBlakeaandTopobeado not differ enough to enable the separation of these genera on the basis of their wood anatomy. Within the Miconieae it is not possible to separate the genera. However, some anatomical differences between the two tribes were found. The genusHuilaeaseems to belong in the Blakeeae although it also shows similarities with the Miconieae. Wurdack's suggestion (pers. comm.) that the Blakeeae are closest to the generaLoreyaandBellucia, and perhaps should be merged with the Miconieae, is supported to some degree.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1979.tb01154.x

年代:1979

数据来源: WILEY

摘要:

SUMMARYPhormidium, Plectonema, LyngbyaandSynechococcusstrains from freshwater‐ and marine habitats were incubated in media with different concentrations of seawater, under different light intensities and temperatures, submitted to different desiccation procedures, tested for endolithic growth in shells and grown on two different media solidified with agar.On the basis of the observed differences in halotolerance, cell dimensions and the reaction pattern with regard to the other parameters used, three taxa, existing at about species level, could be recognized within those strains which were identified asSchizothrix calcicolasensu Drouet. Characters as false branching and sheath morphology could not be used for the distinction between these taxa. The results also led to the conclusions that two other strains, which belong to the Drouet speciesMicrocoleus lyngbyaceus, are no ecophenes of each other. The two coccoidSynechococcusstrains could be ranked under two different species.The results are discussed with regard to Drouet's species concept within the Cyanophyceae. It is suggested to determine the genotypic relationships between the strains used, as a verification of the usefulness of the morphological and ecological characters involved in the delimitation of the different taxa recognize

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1979.tb01155.x

年代:1979

数据来源: WILEY

摘要:

SUMMARYIt is proposed that long distance transport of solutes is controlled by regulation of turgor. Turgor constancy is maintained by import or export of solutes and water from or to the apoplast. This will cause changes in the apoplast pressure which will unbalance waterpotential equilibrium between the apoplast and other cells. Turgor changes are thus caused in these cells which will consequently import or export solutes and water to readjust their turgor.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1979.tb01156.x

年代:1979

数据来源: WILEY

摘要:

SUMMARYA brief survey is given of some main classes of phenolics found in the leaves of species of the pine family (Pinaceae), with emphasis on the flavonoids. Within the limited scope of present knwowledge chemical relationships of taxonomic importance are pointed out.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1979.tb01157.x

年代:1979

数据来源: WILEY

摘要:

In the course of revision work on Triuridaceae for Flora Neotropica a new species ofSciaphilawas recognized, which is described here, anticipating the appearance of the Flora Neotropica issue on certain saprophytic plant groups.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1979.tb01158.x

年代:1979

数据来源: WILEY

摘要:

A new species from Venezuela has to be added to the genusRenealmiarecently monographed by the author for Flora Neotropica.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1979.tb01159.x

年代:1979

数据来源: WILEY

摘要:

In the course of next year a revision of the surinam Musaceae will be published. A newHeliconiaspecies recognized during this study, is described here.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1979.tb01160.x

年代:1979

数据来源: WILEY

摘要:

P. Baas, A. J. Boltonand D.M. Catling, (editors):Wood structure in Biological and technological Research. 280 pp., 25 figs., 25 plates. Leiden Botanical Series No 3. Leiden University Press. The Hague 1976. ISBN 90.602.1.302.5. Price Dfl. 80.00.

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1979.tb01162.x

年代:1979

数据来源: WILEY

摘要:

J. Grace:Plant response to wind. Experimental Botany, volume 13, Academic Press, London, New York, San Francisco 1977. 204 pp., 85 Figs. £ 9.80

ISSN:0044-5983    

DOI:10.1111/j.1438-8677.1979.tb01164.x

年代:1979

数据来源: WILEY