New observations regarding secondary growth and vascular tissues in Welwitschia are
based on roots (used because of the longitudinal orientation of most vascular tissues) …

Adult leaves of Welwitschia are isolateral with large longitudinal and smaller oblique
vascular bundles that anastomose. The thickened outer walls of epidermal cells contain an …

Very young seedlings of Welwitschia have two non-vasculated leaf primordia decussate with
the two cotyledons. Basipetal maturation of xylem and transfusion tissue was observed in …

SINCE features the of publication this singular of Hooker's plant have elaborate already
monograph been investigated (8), internal by features of this singular plant have already …

The paper deals with the anatomy of the leaves and inflorescences of Welwitschia, and with
certain theoretical questions which arose during their examination. Cotyledons, leaves …

The pattern of vascularization of a 1-year-old Welwitschia mirabilis seedling is similar to that
which has been described for a 4-week-old seedling (Butler et al. 1973b) except for the …

Seedlings of Welwitschia mirabilis were grown at the University of California, Berkeley.
Small lanceolate cotyledons gradually increase in size until seedlings are about 6 mo. old. A …

The material used for my investigation was chiefly from that collected by Professor Pearson
in Damaraland in January, 1904, and was preserved in methylated spirit. There were bracts …

Its cotyledons are still attached and the feeder inserted in the husk of the seed. The
lrypocotgl is as yet fairly uniform in thickness, save for a slight swelling at S. The bases of the …

The epidermal structure of the leaf and stem of Ephedra foliata Boiss. is described. The
epidermis of internodes and leaves shows longitudinal rows of cells and stomata. In the …