gymnosperm


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gymnosperm:

see angiospermangiosperm
, term denoting seed plants in which the ovules, or young seeds, are enclosed within the ovary (that part of the pistil specialized for seed production), in contrast to the gymnosperms, in which the seeds are not enclosed within an ovary.
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gymnosperm

[′jim·nə‚spərm]
(botany)
The common name for members of the division Pinophyta; seed plants having naked ovules at the time of pollination.
References in periodicals archive ?
This ensures a more inclusive and updated calibration of phylogenetic trees including not only angiosperms, but also gymnosperms and ferns, due to a higher number of internal nodes being dated, distributed among the entire tree of euphyllophytes.
Characterization of MADS genes in the gymnosperm Gnetumparvifoliumand its implication on the evolution of reproductive organs in seed plants.
Tukey's multiple comparison of the means of leaf litter material accumulated among the forest covers (F), restored areas after harvesting gymnosperm forest plantations (RA-forestry), and open pastures (P).
Yes, there is undisputed evidence of the presence of gymnosperm and flowering plant pollen as well as preserved flowers and cones, in sediments of proposed flood origin.
Based on the fossil record, it is hypothesized that there is genic similarity between gymnosperm and angiosperm coding sequences.
the dominance of spores infers at least seasonally humid conditions and the dominance of gymnosperms indicates dry conditions.
The developmental stage of the nucellus at the time of pollination drop release can vary widely among different gymnosperm taxa.
Fibers: as expected, gymnosperm species tracheids were longer than most of the angiosperm fibers, being almost 2mm length.
Gymnosperm tracheids with torus-margo pit membranes.
Calcite-permineralized and charred plant remains so far reported from the alluvial plain deposits comprise three morphotaxa of pycnoxylic gymnosperm wood, Dadoxylon acadianum, Dadoxylon materiarium and Dadoxylon recentium.