与 «CYCADEOID»相关的英语书籍
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cycadeoid相关的书籍以及同一来源的简短摘要提供其在 英语文献中的使用情境。
1
American Journal of Botany
That the cycadeoid alliance as a whole was of cosmopolitan distribution all
through the Mesozoic should indicate the further capacity to live in the most
varied climates, as already maintained. But that which it is especially desired to
point out is ...
2
Paleobotany and the Evolution of Plants
First, cycadeoid ovules are small (up to 3 mm long), unlike the much larger seeds
of the medullosan pteridosperms. Although debatable, the nucellus of cycadeoid
ovules is said to be fused with the integument except in the apical region.
Wilson Nichols Stewart,
1993
Known unisexual Triassic cycadeoid fructifications probably represent dispersed
abscised microsporangiate complexes or ovulate receptacles preserved after the
abscision of their microsporangiate organs. Cones of the cycadeoids are ...
4
New Organic Architecture: The Breaking Wave
The frond-borne pollen organ of some Paleozoic seed fern has been postulated
as the progenitor of the Mesozoic cycadeoid cone (Delevoryas, 1968a, 1968b).
According to this foliar hypothesis, there has been a progressive reduction of a ...
5
Proceedings of the Third Annual Fossils of Arizona ...
The surface litter layer, consisting mostly of abscissed cycadeoid leaves, was
preserved by initial suspension load fall-out and was not transported. The
depositional setting of the wetland facies is shown schematically in Figure 11
along with a ...
cycadeoid gingko pine tree horsetail fern During the time of Stegosaurus, there
were many more ferns and horsetails than there are today. They grew much
larger than the ones alive now. Some plants of that time are now extinct. One of
these ...
7
Morrison Symposium Proceedings
Based on the microstructures of the laminae and petiole, the plant organs found
in the nodules appear to be most comparable to members of the Cycadeoi- dales
and suggests that at least one species of cycadeoid provided browse for ...
The prototype of an entomophilous flower probably developed while the early
phytophagous insects started to devoure the more platable reproductive organs,
stamens and pistils of cycadeoid plants instead of leaves and stems of ferns ...
9
Proceedings [of The] Zesde Internationaal Botanisch Congres, ...
We cannot quite ignore the view stressed by Gupta, that Homoxylon
rajmahalense may after all have been the wood of a cycadeoid, not of a primitive
dicotyledon. But supposing that it was a cycadeoid — and there is nothing to
prove that it ...
10
Origin and Evolution of Gymnosperms
The frond-borne pollen organ of some Paleozoic seed fern has been postulated
as the progenitor of the Mesozoic cycadeoid cone (Delevoryas, 1968a, 1968b).
According to this foliar hypothesis, there has been a progressive reduction of a ...