Vascular Tissues of Microcycas Calocoma
- 1 November 1926
- journal article
- research article
- Published by University of Chicago Press in Botanical Gazette
- Vol. 82 (3) , 233-252
- https://doi.org/10.1086/333658
Abstract
This endemic Cuban cycad was found at lower elevations than previously reported. Measurements of living plants indicate that they require at least 60 years to attain a height of 10 feet. The protoxylem of the stem is described, and attention called to the prolonged juvenile stage of the secondary xylem[long dash]characterized by scalariform tracheids[long dash]while the mature xylem shows pitted elements. The leaf traces persist long after the leaves fall, and establish secondarily a connection between the inner and outer layers of wood. The phloem shows features distinguishing it from that of ferns and conifers. Features recalling the Medullosae are pointed out. The bundles of the cone axis show a distinct but scanty centripetal xylem, while the bundles of the petiole have this feature well developed. The conclusion is that Microcycas lies well up in the series of cycad genera.This publication has 1 reference indexed in Scilit:
- VIII. On “Transfusion-tissue”: its Origin and Function in the Leaves of Gymnospermous Plants.Transactions of the Linnean Society of London. 2nd Series: Botany, 1897