摘要:

Observations have been made of cotyledon and leaves of beech,Fagus sylvaticaL., with an emphasis on tracheary features. The organization of tissues, including a complex reticulate venation, is typical of many dicotyledons, but the reticulum contains few vein endings per areoles and this condition is probably not common in dicotyledons. This study compares the Madonie leaf vascular pattern with that of the Etna individuals and major venation results the same, but minor venation and areolation differs. We could conclude that tracheogenesis offers good support for the surveys of leaf populations in different ecological habitats and for the study of mechanical supports and long distance transport of water and solutes.

ISSN:0083-7792    

DOI:10.1080/00837792.1984.10670349

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Triploid (2n=3x= 21) sterile populations ofA. trifoliatumfrom Calabria, Sicily, Sardinia, were analysed. Morphological differences were seen but idiograms look very similar in chromosome shape and arm ratio, although the Sardinian plants show a shorter karyotype than the others.

ISSN:0083-7792    

DOI:10.1080/00837792.1984.10670350

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

En référant la situation géographique du Portugal, dont le climat le rapporte intimement aux pays du bassin méditerranéen, l'auteur présente une esquisse historique sur les études cytotaxinomiques menées à l'Institut Botanique de l'Université de Coimbra depuis 1969. On termine par l'analyse des résultats obtenus selon les familles déjà étudiées, en ressortant leurs aspects les plus rélévants et spécifiques.

ISSN:0083-7792    

DOI:10.1080/00837792.1984.10670351

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

A field research in Rome revealed the presence of a surprisingly high number of native orchids belonging to 29 different taxa. Most of them were found in parks developed from old patrician villas and in archeological sites.Epipactis muelleriGodfery,Listera ovata(L.) R. Br.,Ophrys×hoeppneriRuppert,O. sphegodesssp.garganicaNelson, O.vernixiaBrot, andSerapias parvifloraParl, are reported for the first time in the Rome area.

ISSN:0083-7792    

DOI:10.1080/00837792.1984.10670352

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Karyological investigation on populations of theVicia craccaaggregate, in North-west Italy revealed considerable diversity in number (2n= 28, 14 and various intermediate numbers) and morphology of the chromosomes ofVicia craccasensu stricto, occurrence of B-chromosomes in two populations with 2n= 12 ofVicia incanaand both numbers 12 and 14 in a third population.Vicia tenuifoliaappeared to be provided with the known karyotype with 2n= 24 and chromosomes very similar to those noticed in the karyotypes ofVicia incana.

ISSN:0083-7792    

DOI:10.1080/00837792.1984.10670353

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

ISSN:0083-7792    

DOI:10.1080/00837792.1984.10670354

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

TurkishLemnaceaeconsists of 5 species, viz.Spirodela polyrhiza(L.) Schleiden,Lemna gibbaL.,L. minorL.,L. trisulcaL. andL. turioniferaLandolt. The Turkish distribution of the species was mapped. Duckweeds seem to be rare or absent along the southern fringe of the country, and in Inner and N. Anatolia between 32° and 42° E. This coincides with a paucity of suitable habitats, but also with the undercollected regions of Turkey.

ISSN:0083-7792    

DOI:10.1080/00837792.1984.10670355

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

ISSN:0083-7792    

DOI:10.1080/00837792.1984.10670356

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

ISSN:0083-7792    

DOI:10.1080/00837792.1984.10670287

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor