摘要:

SUMMARYSphaerocarpos stipitatusBisch. ex Lindenb. (syn.S. berteriiMont.) is re‐described from the original material gathered in Chile in 1829. Material recently discovered in South Africa is shown to belong to the same species. Detailed studies of structure, development and cytology were made on the South African plants, both preserved and in culture.The genusSphaerocarposis reviewed. It is re‐emphasized thatSphaerocarposnormally has ‘leafy’ gametophytes, with a distinct and definite arrangement of the appendages. The general systematic position of the Sphaerocarpales is di

ISSN:0368-2927    

DOI:10.1111/j.1095-8339.1954.tb00008.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

SUMMARYThe anatomical structure of different plant organs of nearly all the species of the eight genera of the Xanthorrhoeaceae has been described. The xylem elements of representative species of all the genera have been investigated in macerated material. True vessels have been found in the roots of all the genera, and in the leaves ofXanthorrhoeaandAcantho‐carpus.No tracheal elements except tracheids have been seen in the leaves of the other genera, or in the stems or rhizomes of all the genera. When these data are compared with those established by Cheadle (1942) for other families of the monocotyledons, it will be seen that the Xanthorrhoeaceae most closely resemble the Agavaceae. Amphivasal vascular bundles occur in the stems and/or rhizomes of all the genera exceptKingiawhere the xylem in all the bundles is U‐shaped in transverse section. The stem structure ofXanthorrhoeaprovides evidence that the amphivasal type structure has arisen by the fusion of pairs of bundles with U‐shaped xylem. The leaves of all the genera have a xero‐morphic anatomical structure. Special arrangements and structures, which prevent excessive evaporation occur in the stomatal regions inXanthorrhoea, KingiaandBaxteria.A special type of palisade cell with annular contractions, and/or with papillose projections, occurs inKingia, Calectasia, Lomandraand to a lesser extent inDasypogon, and traces of this type of structure are also to be seen in the other genera of the

ISSN:0368-2927    

DOI:10.1111/j.1095-8339.1954.tb00009.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

ISSN:0368-2927    

DOI:10.1111/j.1095-8339.1954.tb00010.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY