摘要:

DAHLGREN, C, 1989.An updated angiosperm classification.A new two‐dimensional diagram, reflecting the system of classification of the angiosperms, is presented. It combines the dicotyledon diagram in G. Dahlgren (1989) and an adapted monocotyledon diagram after that in Dahlgren (1985) in a single diagram. An updated monocotyledon taxonomy is presented and the classification is appende

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb01717.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

BATEMAN, R. M.&FARRINGTON, O. S., 1989.Morphometric comparison of populations ofOrchis sitniaLam. (Orchidaceae) from Oxfordshire and Kent.Univariate and multivariate morphometric analyses ofOrchis simiaLam. from its two remaining naturally‐founded populations in Britain (Goring, Oxfordshire and Faversham, Kent) reveal only minor morphological differences between the populations and suprisingly low levels of intra‐population variation. This probably reflects recent founding from Continental seed at Faversham and penecontemporaneous, human‐induced, catastrophic contraction of the gene pool at Goring. The apparently restricted gene pools of these populations may adversely effect their long‐term s

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb01718.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SOUMATI, B.&DICK, M. W., 1989.Biometry of oogonia and oospores of Saprolegniaceae. The distribution of data on the dimensions of oogonia and oospores for modal and near modal classes of oospore number per oogonium in multiovulate Oomycetes has been determined. Thirteen species of Saprolegniaceae have been examined. Two fundamental relationships have been identified: the first relationship is that of common intercept line regression between the oogonium volume and the mean volume of oospores, the second relationship is that of parallel line regression between the oogonium volume and the sum of volumes of oospores. Neither the quality of water nor the cultural temperature had a significant effect on the pattern of the two relationships. The general pattern of these relationships was the same for all species and with all modal classes tested.Achlyaspecies had higher intercepts in the first relationship and lower slopes in the second relationship compared withSaprolegniaspecies. The species ofhoachlyaexamined occupied a more intermediate position. The fact that the dimensional relationships are significantly different for different classes of oospore number per oogonium means that these statistics must be considered when writing descriptions of species. The use of overall dimensional ranges embracing all oospore number classes may obscure taxonomic discontinuities.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb01719.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

HYDE, K. D.&JONES, E. 6. G., 1989.Ecological observations on marine fungi from the Seychelles. Submerged wood, wood trapped amongst rocks, sand‐buried wood and exposed roots and branches of shoreline trees were collected from three intertidal beach sites in the Seychelles. These were examined for the presence of marine fungi, the species present identified and their frequency of occurrence noted. Leaves, seaweeds and seagrasses washed up on the seashore, and seafoam, were also examined for filamentous marine fungi. Species present are listed with their frequency of occurrence. Differences in species composition from one substratum to the next were noted, and the results discussed. Sixty‐three species were collected: 35 Ascomycotina, 2 Basidiomycotina and 26 Deuteromycotina, all are new records for the Seychelles. The mycogeography and ecological niche of the fungi encountered are discus

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb01720.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

BARLOW, P. W., 1989.Meristems, metamers and modules in the development of shoot and root systems. Root and shoot systems are hierarchical organizations whose levels are represented, in part, by cells and meristems. Meristems produce modules which in turn construct the architectural model. The latter is species specific and its structure depends on the geometrical interrelationships between the modular elements. The place of the metamer within this hierarchical scheme is discussed. Metamers derive directly from meristem activity and are externally recognizable as reiterated sub‐units of the module. Another sub‐unit of module construction, the cellular complex, or merophyte, is also a product of meristem activity, but, in contrast to the metamer, it is an internal, rather than an external, anatomical feature. Being cellular, it increases the ‘span’ of the cell level rather than constituting a level in its own right. Although the physical boundaries of metamer and merophyte can overlap, or even coincide, the two units belong to different conceptual schemes of module structure: the metamer is defined from a ‘classical’ morphological viewpoint, whereas the merophyte derives from a cellular conception of plant structure. Both the merophyte and the metamer have a role in clarifying the understanding of plant development since both provide insights into the functioning of the meristems from which they are derived and the structure of the module to which they contribute. For example, modules which lack an obvious metameric construction can usefully be analysed in terms of their merophytic organization. This is particularly true of roots of lower plants. Here, the merophytes reflect the presence and activity of a specialized meristematic apical cell. On the other hand, modules of higher plants, which lack such apical cells, also lack clearly defined merophytes, but their shoots have obvious metamers which reflect the activity of the meristem as a whole.It should be possible to represent the development of modules from cells, via their intermediate sub‐structures of meristems and metamers, by means of formal languages of automata theory. One of these, a graphical algorithm (Petri net), is applied in this developm

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb01721.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Book reviewed in this article:Taxonomy of Economic Seaweeds: With reference to some Pacific and Caribbean Species, 2 edited by Isabella A. Abbott. La JollaBotanic Gardens and the World Conservation Strategy edited by D. Bramwell, O. Hamann, V. Heywood&H. SyngeIntroduction to Ecological Biochemistry 3rd ed., by J. B. HarborneA monographic study of the genus Rosularia (Crassulaceae) by Urs EggliThe Photographic Guide to Identify Mediterranean Wild Flowers by Roger Phillips assisted by Martin Rix and Nicky FoxThe Photographic Guide to Identify Mediterranean Wild Flowers by Roger Phillips assisted by Martin Rix and Nicky FoxConserving the Wild Relatives of Crops by Erich Hoyt.Somatic Cell Genetics of Woody Plants edited by M. R. AhujaIndian Journal of Natural Rubber ResearchDictionary of Weeds of Eastern Europe by G. Williams and K. HunyadiNutrition of the Angiosperm Embryo by David R. Murray.Plant Pigments edited by T. W. Goodwin.Panbiogeography edited by R. Craw&G. SermontiSaxifrages of Europe: with notes on African, American and some Asiatic species by D. A. Webb&R. J. Gornall

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb01722.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY