prothallial cell

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• prothallial cell — noun : one of the cells produced by the first division of the microspore in a gymnosperm and believed to be a vestige related to the fern prothallus …   Useful english dictionary

• antheridial cell — noun : a cell that remains after one or more vegetative or prothallial cells are cut off from the microspore and that gives rise to tube and generative cells of the male gametophyte of gymnosperms …   Useful english dictionary

• prothallium — prothallial, prothallic, prothalline /proh thal een, uyn/, adj. prothalloid, adj. /proh thal ee euhm/, n., pl. prothallia / thal ee euh/. 1. Bot. the gametophyte of ferns and related plants. 2. the analogous rudimentary gametophyte of seed… …   Universalium

• plant development — Introduction       a multiphasic process in which two distinct forms succeed each other in alternating generations. One form, created by the union of sexual cells (gametes (gamete)), contains two sets of similar chromosomes (diploid). At sexual… …   Universalium

• conifer — /koh neuh feuhr, kon euh /, n. 1. any of numerous, chiefly evergreen trees or shrubs of the class Coniferinae (or group Coniferales), including the pine, fir, spruce, and other cone bearing trees and shrubs, and also the yews and their allies… …   Universalium

• Drynaria — Basket ferns Temporal range: Piacenzian to Present …   Wikipedia

• fern — fernless, adj. fernlike, adj. /ferrn/, n. any seedless, nonflowering vascular plant of the class Filicinae, of tropical to temperate regions, characterized by true roots produced from a rhizome, triangular fronds that uncoil upward and have a… …   Universalium

• Fern — /ferrn/, n. a female given name. * * * Any of about 10,000–12,000 species (division Filicophyta) of nonflowering vascular plants that have true roots, stems, and complex leaves and reproduce by spores. Though ferns were once classified with the… …   Universalium