• William C Dickison

      Articles written in Proceedings – Plant Sciences

    • The veinsheath syndrome in Cunoniaceae IPancheria Brongn. & Gris.

      T Ananda Rao William C Dickison

      More Details Abstract Fulltext PDF

      Veinlet sheathing of twenty-six species ofPancheria is described and illustrated. Within the genus foliar vein sheathing varies from almost completely lacking to abundant, and individual sheath cells show much variation in cell wall composition and structure. The topographical distribution of sheath cells along the vein system, when coupled with the structure of individual sheathing elements, can be utilized to distinguish three anatomical groups of species. Although the evolutionary sequence and ecological significance of the diverse sheath types are at present unresolved, features of vein sheathing appear to be of systematic significance and may provide an additional basis for a better understanding of infraspecific relationships within this genus.

    • The veinsheath syndrome in Cunoniaceae. II. The generaAcsmithia, Codia, Cunonia, Geissois, Pullea andWeinmannia

      Tananda Rao William C Dickison

      More Details Abstract Fulltext PDF

      The high order foliar vein sheathing of 40 species representing 6 genera of Cunoniaceae was examined. The type, orientation, distribution, and proportion of the sheathing elements around the veinlet, including the terminal cells, are variable and useful for generic circumscription and subdivision. Terminal cells are tracheoidal or sclereidal types. A general trend towards the formation of specialized sclerenchymatous terminal elements is supported.

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