摘要:

Nell'ambito degli studi sulla flora macromicetica della provincia di Pisa, l'estrema punta Sud del territorio non risultava ancora indagata.

ISSN:0083-7792    

DOI:10.1080/00837792.1987.10670408

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Two diploid subspecies ofDactylis glomerataL. are recognized to be present in Italy.D. glomeratasubsp.aschersonianais present in mesic mixed broadleaved forests of Friuli (North-eastern Italy); its occurrence in other parts of the territory is questioned. D.glomeratasubsp.reichenbachiiis an endemic ofPinus sylvestriswoods of Alto Adige. Furthermore, diploid individuals have been observed irregularly scattered through Northern Italy. Such individuals are morphologically very variable, and do not deserve a particular taxonomic treatment.

ISSN:0083-7792    

DOI:10.1080/00837792.1987.10670409

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Da una revisione del genereAristolochiaL. (Aristolochiaceae) in Corsica, condotta su basi sperimentali (esame di materiale d'erbario, analisi delle popolazioni in natura), risultano presenti nell'isola quattro taxa:A. clematitisL., rara;A. rotundaL. subsp.rotunda, che si manifesta con fenomeni introgressivi;A. rotundaL. subsp.insularis(Nardi et Arr.) Gamisans, l'entità di gran lunga più diffusa;A. tyrrhenaNardi et Arr., estremamente localizzata. Nello stesso tempoA. longaL., o altre entità appartenenti al medesimo complesso sistematico,A. pistolochiaL. eA. pallidaWilld. vengono escluse dalla flora corsa.

ISSN:0083-7792    

DOI:10.1080/00837792.1987.10670410

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Se avanzan los primeros resultados obtenidos del estudio dePsilotum nudum(L.) P. Beauv. var.molesworthaeIranzo, Prada & Salvo, especialmente aquellos derivados del estudio del aparato estomático y de la banda de Caspary.

ISSN:0083-7792    

DOI:10.1080/00837792.1987.10670411

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The present study briefly deals with the ecological factors of the island of Crete, i.e. its geology, soils, climate and vegetation with particular reference to the endemic speciesZelkova abelicea(Lam.) Boiss.

ISSN:0083-7792    

DOI:10.1080/00837792.1987.10670412

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In spite of accurate floristic investigations,Armeria pungensreported by Bequinot in rocky facies, has not been found in Garofani's island. Its disappearance, as it has already happened in the nearby Tavolara's island, limits the presence of this species to the small Sardinian islands of Spargi (bibliographical data) and sa Mesalonga (author's observations). Some more new entities for the island of Garofani are also reported.

ISSN:0083-7792    

DOI:10.1080/00837792.1987.10670413

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Viene segnalata per la prima volta in Liguria la presenza diChamaerops humilisL., rinvenuta in tre stazioni nel versante sud del promontorio di Portofino.

ISSN:0083-7792    

DOI:10.1080/00837792.1987.10670414

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In questo contributo compare un elenco floristico di 131 entità nuove per il Monte Alburno; con queste aggiunte la flora del massiccio sale a 1196 entità. In tale elenco non pochi sono gli elementi di buon interesse floristico e fitogeografico; tra questeSilene echinataOtth,Berteroa obliqua(Sm.) DC. eVicia barbazitaeGuss, et Ten. non erano state mai segnalate finora per la Campania. Il lavoro è corredato anche da una breve analisi in cui lo spettro corologico del Monte Alburno viene comparato a quello dei vicini Monti Picentini.

ISSN:0083-7792    

DOI:10.1080/00837792.1987.10670415

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Viene descritta la vegetazione di un bacino palustre di origine glaciale e carsica, situato sull'altipiano di Folgaria (Trento) a m 1257, nel quale si trova anche un giacimento di torba.

ISSN:0083-7792    

DOI:10.1080/00837792.1987.10670416

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A scheme of the classification of the families of Pteridophyta is given, with the addition of the base chromosome numbers which have been recorded in each of them. Various observations and comments which emerge from the examination of the scheme are made. The great difference in the quantity of base numbers among the families, and the remarkable quantity of different base numbers in certain families are pointed out, and a comparison between the various families is made, particularly as regards those which are considered as primitive or advanced. Special attention is drawn to the value of the base numbers recorded in each family. In this connection some interesting features of the Pteridophyta are emphasized: the remarkable prevalence of high base numbers; the fact that the great majority of homosporous families has base numbers higher thanx= 25, while no base number higher than that value occurs in the heterosporous ones; the scarcity of base numbers which correspond to prime numbers, particularly to the small ones; and the presence of some genera in which the base number is tetraploid, or even hexaploid or octoploid, in comparison with the diploid base number of most of the genera of the same family. Details on these observations are given and their interpretation is dealt with, particularly as far as the importance of the polyploidy and the aneuploidy in the genesis of new groups is concerned. Finally, the results of the recent electrophoretic investigations on the enzymes and isozymes of some species with high chromosome numbers are discussed in relation to the evolution of the Pteridophyta.

ISSN:0083-7792    

DOI:10.1080/00837792.1987.10670417

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor