摘要:

Records of nearly 1500 species of marine algae present in over 80 countries, states, and islands of the tropical and subtropical Atlantic were analyzed to ascertain the relationships between their floras. Association analysis was unsatisfactory, cluster analysis was better, but, of the classificatory methods, indicator species analysis was best. However, the most meaningful results were obtained by ordination using reciprocal averaging. This method demonstrates that after the separation of the marine flora of South‐West Africa (Namibia), two clearly defined groupings representing the eastern Atlantic and the western Atlantic are apparent. On the western side, the floras, apart from that of Uruguay, are a relatively close‐knit group, except that the northern coast of the Gulf of Mexico together with the southern Atlantic States of the U.S.A. are distinct from the southern Gulf of Mexico and Caribbean groups. On the eastern side of the Atlantic the floras are less closely related. A well‐marked tropical group extends from Gambia to Cameroun but does not include the Gulf of Guinea islands which form another group with Angola. This latter group is transitional to the colder water floras lying northwards of Senegal and south of A

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1978.tb02360.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

Seeds closely resembling those of some species of the extant genusRhododendronL. have been recovered from the Reading Beds near Newbury, Berkshire. The fossils are assigned toRhododendron newburyanumsp. noV. on the basis of detailed comparisons with seeds of extantRhododendronspecies, other Ericaceae, and taxa with seeds of similar morphology.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1978.tb02361.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY

摘要:

A survey of the pteridophytes of Mauritius is presented, including a summary of their habitats, ecology, and phytogeographical affinities. Of the 186 infrageneric taxa recorded from the island, 8 are adventive or naturalized, and 27 are presumed rare or extinct. Major ecological groupings are presented and species are listedforboth indigenous and secondary plant communities.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1978.tb02362.x

出版商:Blackwell Publishing Ltd    

年代:1978

数据来源: WILEY