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 ?
gattii has been reported from 54 tree species; most (77%) are angiosperms; gymnosperms account for 23% of positive species (Table 2).
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.
The developmental stage of the nucellus at the time of pollination drop release can vary widely among different gymnosperm taxa.
In one case, the presence of tracheids in cross-section allows the identification of gymnosperm (softwood) tissue (Figure 4).
Interpretation: Preserved detail is sufficient to identify the material as pycnoxylic gymnosperm wood of Dadoxylon-type, the preserved rind comprising the secondary xylem cylinder, and the central void, marking the probable position of the decay-expanded pith.
Based on the fossil record, it is hypothesized that there is genic similarity between gymnosperm and angiosperm coding sequences.
gymnosperm pollen lacks pollenkitts and therefore rarely if ever clumps naturally (Wodehouse 1935).
Gymnosperm pollens clearly dominate the assemblage (80%); spores are very much subordinate components (20%).
FTIR-derived characteristics of fossil gymnosperm leaf remains of Cordaites principalis and C.
These units contain considerable numbers of marine bivalves, cuticle of the gymnosperm Pseudofrenelopsis (Perkins and Langston, 1979), and numerous fragments of carbonized wood.
2] transport in wetland plants have focused exclusively on angiosperms, with the exception of one study that investigated the gymnosperm Taxodium distichum L.