«MEGASPORANGIA» 관련 영어 책
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1
Botany For Degree Pteridophyta
In M. minuta a sorus has 4-8 megasporangia and 8-13 microsporangia. In M.
aegyptiaca there are 5-16 mega and 9-19 microsporangia. Megasporangia are
sometimes absent in sori of M. minuta, M. rajasthanensis and M. vestita. Mehra
and ...
2
Annual Plant Reviews, The Evolution of Plant Form
Homosporous Lycopodiaceae, for example, produce a single type of spore that
will give rise to the male and female gametophytes, while the heterosporous
lycophytes produce spo— rangia of different sexes: megasporangia that produce
...
Barbara A. Ambrose, Michael D. Purugganan,
2012
3
An Introduction to the Study of Algae
in size, the smallest being the antheridia and the largest, or megasporangia, the
oogonia. The contents of the larger megasporangia are sometimes capable of
parthenogenetic development, when they must be regarded as incipient or ...
4
An Introduction to Pteridophyta: Diversity, Development, ...
As few as nine and as many as 48 megaspores have been counted in different
megasporangia ofA.jacksonii and 9-16 in A. laetifolia. It, therefore, appears that in
Upper Devonian the number of spores in Archaeopteris megasporangium was ...
5
The Evolutionary Biology of Plants
In addition to bearing mixed sporangia, the Devonian plant Chaleuria cirrosa
produced microsporangia (containing only small spores measuring from 30 to 48
/um in diameter) and megasporangia (containing spores measuring 60 to 156 /
um ...
6
An Introduction to the Study of Algae
in size, the smallest being the antheridia and the largest, or mega- sporangia, the
oogonia. The contents of the larger megasporangia are sometimes capable of
parthenogenetic development, when they must be regarded as incipient or ...
7
Vascular Plants and Paleobotany
The reproductive structures, megasporangia bearing ovules (Figure 2A–C) (from
female trees) and microsporangia bearing pollen (Figure 2D–F) (from male trees)
, emerge at the apex of short, determinate (spur) shoots. A discreet flush of ...
Philip Stewart, Sabine Globig,
2011
E. Strobilus longitudinal section, showing sporophylls, megasporangia, and
microsporangia. F. Close-up of microsporangium, containing microspores. G.
Close-up of megasporangium, containing megaspores. H,I. Isoetes howellii. H.
Plants ...
9
Algae, Fungi, Lichens, Microbiology, Plant Pathology, ...
The receptacle of the sorus bears microsporangia at the corners and
megasporangia all along the receptacular ridge. 7. On the upper and lower sides
of the receptacles, two masses of gelatinous ring, cut transversely, are present.
The upper ...
Ashok M. Bendre, Ashok Kumar,
2010
10
Fundamentals of Plant Science
All ovules are megasporangia, though of course all megasporangia are not
ovules. (Those which occur among pteridophytes are not ovules and Selaginella
is not the only member of the pteridophytes which produces megasporangia.) ...
John Gaylord Coulter,
1993