单词 ARCHEGONIUM的词源
From New Latin, from Greek arkhegonos original parent, from arkhe- chief, first + gonos seed, race.
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archegonium的用法。与
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1
Competition Science Vision
Soon after the antherozoids. are formed they are liberated in semi fluid surface
film through which they reach the archegonium by swimming. Archegonium : A
nearly mature archegonium of Riccia consists of following structures — (a) A
short ...
The archegonium consists of an outer layer of sterile cells, termed the venter, that
immediately surround the egg plus others that extend outward as a tube-like neck
. The archegonium is stalked in some taxa; in others the egg is rather deeply ...
3
University Botany Ii : (Gymnosperms, Plant Anatomy, ...
The archegonium in Pinus is a simple structure. Each archegonium consists of a
short neck and a swollen venter. The neck consists of four cells arranged in a
single tier. There are no neck canal cells. The venter contains an egg or
oosphere ...
S M Reddy, S J Chary, 2003
4
Competition Science Vision
E. Two spermatozoids. Archegonium — The archegonium develops from a single
celled archegonial initial which grows and projects above the surface of thallus. It
then divides transversely into an outer or upper cell and a lower or basal cell.
5
Botany for Degree Students Part-III: Bryophyta
It is transformed into an archegonium. Porella thus is acrogynous. The
archegonia occur in a terminal cluster (Fig. 10.7). The further growth of the
archegonial branch is arrested after the formation of the terminal archegonium in
the cluster.
B R Vashishta, A K Sinha, Adarsh Kumar, 2011
6
Cryptogams: Algae, Bryophyta and Pterldophyta
A few divisions, occur in the basal cell but it does not contribute to the
development of archegonium. Two anterior rows of neck grow much faster as
compared to posterior ones so that the neck becomes curved towards posterior
side of ...
7
Developmental Biology of Fern Gametophytes
Archegonium development and differentiation The archegonium of fern
gametophytes is a more complex and uniform structure than the antheridium.
Basically it is a flask-shaped object and consists of an enlarged basal region
buried in the ...
8
University Botany I : (Algae, Fungi, Bryophyta And Pteridophyta)
The mouth of the archegonium is covered by 4 lid or cover cells. Archegonium is
covered by a single layer of sterile cells. Archegonium develops on the dorsal
surface of the receptacle from a single cell called "Archegonial initial cell" (Fig.
2.6).
9
An Introduction to Pteridophyta: Diversity, Development, ...
Opening of Archegonium Archegonia may be considered to be mature when they
open in water within an hour or so. Immature archegonia do not open even on
prolonged exposure and overmature or dried ones open immediately.
10
The Ferns (Filicales): Volume 1, Analytical Examination of ...
278. a— d= Maratiia Douglasii, after Campbell. e—f=Ophio- glossum pendulum,
after Lang. a = antheridium, with divisions of spermatocytes (32) in section,
perhaps not complete; £ = young antheridium ; c = archegonium ; d = young ...
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... fern Ceratopteris richardii forming a “bouquet” at the entrance (not shown) of an open archegonium (magnification = 3000×). When released from antheridia, ... «Am J Botany, 十二月 14»
Moss: Beautiful, but misunderstood
The green plant we see is the sexual stage, which produces gametes (sperm-antheridium and egg-archegonium). Moisture is necessary for ... «Timesonline.com, 五月 14»
Trekking back in time among Okinawa's fronded wonders
Sperm from the male organ (antheridia) of one prothallium swim into the female organ (archegonium) of a nearby prothallium. There, sperm ... «The Japan Times, 八月 13»
How Mosses Have Sex in Spite of Their Swimming-Challenged Sperm
... crannies of mosses in search of an egg concealed within a protective structure called an archegonium. As Gathering Moss author Robin Wall ... «Scientific American, 七月 12»
