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Two years and one year pass from ovule initiation to appearance of developed embryos in both Ceratozamia mexicana and Zamia furfuracea respectively. The two species are from contrasting environments, but gametophyte development is similar, though differing in speed. C. J. Chamberlain sustained that the transference of nutrients from the jacket to the central cell occurs through cytoplasmic projections from the central cell. We confirm and describe these connections for the two species using the Schiffâ€™s reaction, staining the cell wall of the central cell. The connections occur between the central cell and the transfer cells that make up the archegonial jacket, through pits in the central cell wall. Cytoplasmic projections measure an average of 7 Î¼m and transverse the cell wall through pits measuring 7.5 Î¼m and 10.5 Î¼m in diameter for Ceratozamia and Zamia respectively. The central cells and transfer cells of both species are described in detail.
Keywords: archegonium, central cell, transfer cell, seed
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Andrew Vovides was born in London, England in 1944. His parents, both Cypriots, emigrated to London in the mid- 1930s. His early education took place in London and he took engineering diplomas whilst working as an optical instruments engineer for a London based firm. He later took a position as a laboratory technician at the Botany department at Birkbeck College, London University. He obtained an Honors Botany Degree at the University of Wales, Cardiff and in 1975 he emigrated with his Mexican wife Victoria to Mexico, where he took up a research position at the lnstituto de Investigaciones Sobre Recursos Bioricos (IIREB) under Arturo Gomez-Pompa at Xalapa. His first project with Arturo was the foundation of the Jardin Bocinico Francisco Javier Clavijero, inaugurated on 17 February 1977. In 1978, Andrew had a three-month internship at the Royal Botanic Gardens, Kew where he worked with the Deputy Curator of Living Collections, Ian Beyer, and his staff on the intricacies of running a botanic garden. Andrew was also a founding member and first secretary of the Mexican Association of Botanic Gardens. Andrew became interested in cycads when Arturo Gomez-Pompa invited him to collaborate with John Rces on the Florade Veracruz treatment for Zarniaceae. Andrew was becoming acquainted with Mexican cycads and studying for a Ph.D. on the biology of Mexican cycads at the Botany Dept. at Cardiff. During his course of graduate studies he built up the Mexican National Cycad Collection at the Garden and obtained his Ph.D. in 1988 at a time when IIREB was closed and the Garden passed under the administration of the present lnstituto de Ecologia, A.C. He served a one-year post-doctoral internship at Fairchild Tropical Botanic Garden with Knut Norstog working on aspects of cycad pollination. Andrew has held scientific positions as a research botanist, botanic garden director and curator at Instituto de Ecologia, and serves as a member IUCN Cycad Specialist Group. He has produced over 100 scientifi Andrew Peter Vovides's Author Page