The anatomy of bark. IV. Radially elongated cells in the phelloderm of species of Eucalyptus

Abstract

The occurrence of a palisade of radially elongated cells, sometimes heavily sclerosed, in the phelloderm of certain species of Eucalyptus is described. These cells have been observed in 71 out of 272 species examined. They vary greatly in degree of development both between different species and, in some instances, between different samples of the same species. The extreme variation observed in this feature is discussed with special reference to the occurrence of interspecific hybridization within the genus.