One of the most important discoveries made during the latter part of the 19th century was that by Ikeno, a Japanese botanist, who first demonstrated the existence of motile male cells in the genus Cycas.
.;.:~~: cilia are grouped along .~ the cytoplasmic anterior D portion of the spiral In Zamia (fig 4 A), Cycas and Ginkgo they consist of large spherical or oval cells with a coiled band of cilia at one end, and ~ ~ a large nucleus which nearly fills the cell They are carried by the pollen tube to th
Short and reticulately-pitted tracheal cells, similar to tracheids, often occur in the circummedullary region of cycadean stems. In an old stem of Cycas, Encephalartos or Macrozamia the secondary wood consists of several rather unevenly concentric zones, while in some other genera it forms a continu
The long linear leaves of some species of Podocarpus, in which the lamina is traversed by a single vein, recall the pinnae of Cycas; the branches of some Dacrydiums and other forms closely resemble those of lycopods; these superficial resemblances, both between different genera of conifers and betwe
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