Structure of the Bark and Clonal Variability in Hevea brasiliensis Muell. Arg. (Willd. ex A. Juss.)

Detailed studies have been made on the structure of the barkof ten Hevea clones and the clonal variabilities with regardto the density and size of ray groups, density of laticifersper row per unit circumference of the tree, diameter of laticifersand the extent of connection between laticifers. Clonal variabilitywas highly significant with regard to the density of ray groups,ray height, ray width in the laticifer layer and the laticifercharacters. The influence of ray characters on the orientationof laticifers and thereby its quantity is discussed. The scopeof using anatomical parameters for clone identification is examined. Hevea brasiliensis, Para rubber tree, laticifers, bark (structure), anatomy, clonal variability, rubber     

Occurrence of Intraxylary Phloem in Hevea brasiliensis (Willd. ex A. Juss.) Muell. Arg.

The occurrence of intraxylary phloem in Hevea brasiliensis isreported. The phloem elements were observed as strands associatedwith the protoxylem group in the pericentral region. The natureand importance of such tissue in this species are discussed. Hevea brasiliensis, intraxylary phloem, laticifers, tapping