The Gymnosperms

  title={The Gymnosperms},
  author={Charles Joseph Chamberlain},
  journal={The Botanical Review},
Complex reproductive secretions occur in all extant gymnosperm lineages: a proteomic survey of gymnosperm pollination drops
It is demonstrated that all extant gymnosperm groups produce complex reproductive secretions containing proteins, an ancient trait that likely contributed to the evolutionary success of seed plants.
Best in the company of nearby males: female success in the threatened cycad, Zamia portoricensis
The possible mate-finding Allee effect indicates that pollinator movement among plants may be limited for this mutually dependent plant-pollinator interaction, and being close to male plants is a matter of chance.


On the Formation of Proembryo of Ginkgo biloba L.
The fertilization and the formation of the embryo of Ginkgo have been studied by HIRASE (1895, 1918), IKENO (1901), and more recently by HERZFELD (1926, 1927). Yet there are many unsolved problems,
Life History of Encephalartos
No proembryos were found containing sperm remnants, indicating that fertilization by a sperm is not necessary for the production of the pro Embryo, suggesting a probability of fusion of egg and ventral canal nuclei.
A Morphological Comparison of Leaflets of a Hybrid Cycad and the Two Parents
A morphological study of the leaflets of a hybrid cycad obtained from a cross between Ceratozamia mexicana and a new species, Zamia monticola, shows that some of the structures distinctly resemble
On the Structure and Affinities of Acmopyle Pancheri, Pilger
An investigation of some material collected in New Caledonia by Prof. R. Compton, M. A., during his expedition to that island in 1914 is undertaken.
Female Gametophyte of Microcycas
1. The ovules were not young enough to show the megaspore mother cell or the megaspores, the youngest stage of the female gametophyte showing free nuclear condition in the megaspore. 2. In older
The Caytoniales, a New Group of Angiospermous Plants from the Jurassic Rocks of Yorkshire
The study of fossil plants during the last quarter of a century has revealed a vast amount of information about the past history of many modern plant types. But while we have learned much about the
Some Characters of Xylem Tissue in Cycads
A study of the primary and secondary wood of Cycads indicates the development of reticulate, alternate, and opposite pitting directly from scalariform types, which is considered the most primitive in living seed plants.
Clogging of Stomata of Conifers in Relation to Smoke Injury and Distribution
  • J. Rhine
  • Environmental Science
    Botanical Gazette
  • 1924
1. The black deposit found in the stomatal pits of certain conifers, and thought to be soot, was found to be a natural product of the leaf. 2. The substance in the stomata of juniper, fir, and