摘要:

DICK. M. W., CROFT, B. J., MAGARF.Y, R. C, de COCK, A. W. A. M.&CLARK, G., 1989.A new genus of the Verrucalvaceae (Oomycetes). A fungus, isolated from sugar cane in Queensland, Australia and causing the Poor Root Syndrome disease, is described and shown to be related toVerrucalvusand possesses verrucate oogonia containing plerotic oospores; it is placed in the Verrucalvaceae (Sclerosporales). On the basis of morphological and DNA studies the Verrucalvaceae has to be placed in the Saprolegniomycetidae. It follows that the order Sclerosporales (and also the Leptomitales) must be removed from the Peronosporomycetidae and placed in the Saprolegniomycetidae.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb00394.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SCHNELLER, J. J., 1988.Remarks on hereditary regulation of spore wall pattern in intra‐and interspecific crosses ofAthyrium. Artificial crosses betweenAthyrium filix‐feminasubsp.angustum, subsp.cyclosorum, subsp.filix‐feminawith a rugulose perispore andA. filix‐feminasubsp.asplenioideswith a folded rugulose perispore are investigated. In the sporangia of the F‐l generation all the spores are of the same intermediate perispore pattern. This suggests a sporophytic regulation of the spore ornamentation and a codominant inheritance of the wall characters. Natural hybrids between diploidA. filix‐feminawith rugulose perispore and diploidA. distenlifoliumwith folded rugulose perispore are integrated in this study. The observations on spores of these hybrids showing different ploidy levels and different genetic combinations support the suggestion of a sporophytic regulation of spore ornamentation. The extent of folding changes gradually, depending on the occurrence and ratio of the genome ofA. distenlifoliuma result that is in agreement with the idea of a codominant

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb00395.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

WILKINSON, H. P., 1988.Leaf anatomy of the Menispermaceae tribe Tiliacoreae Miers. An anatomical study of the leaves of 25 species belonging to 12 of the 19 genera has been made. The anatomical characters found to be of the most use in distinguishing taxa or groups of taxa are: in surface view–stomatal outline, stomatal density and distribution, subsidiary cell or surrounding cell patterns, presence /absence of hairs; in transverse sections–dimensions of adaxial epidermal cells, morphology of spongy mesophyll, midrib outline, number and distribution of vascular bundles, presence/absence of an upper pulvinus, presence/absence of sclereids in the upper pulvinus, presence/absence of secretory sacs, crystal type and distribut

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb00396.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

PATE, J. S. KUO, J., DIXON, K. W.&CRISP, M. D., 1988.Anomalous secondary thickening in roots ofDaviesia(Fabaceae) and its taxonomic significance. Investigations of 55 species ofDaviesiashow 24 to have anomalous secondary vascular development in their roots and the remainder to be of conventional root anatomy. Species showing the trait exhibit early cessation of cambial activity in the central stele of the seedling followed by differentiation of a series of concentric layers of inter‐connecting vascular strands, each layer derived from new cambial activity in pericycle tissue outside the existing vasculature. The ontogeny and mature structure of the anomalously thickened roots of certain species is described and the findings compared with published data for other genera of dicotyledons. A cladogram is presented to portray the phylogeny of the species ofDaviesiaincluded in the study, using 36 morphological features and the parsimony method to derive minimum length Wagner‐type trees from a matrix of taxa character states. Evolution of the character of anomalous root thickening is concluded to have occurred early and possibly on two independent occasions during specialion of the ge

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb00397.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1989.tb00398.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY