A Student's Text-Book of Botany
A Student's Text-Book of Botany
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In our eReader you can find the full English version of the book. Read A Student's Text-Book of Botany Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Student's Text-Book of Botany
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The sexual organs are always malti- CftUalar. The antheridlum (Figs. 233, 234) is a capsule of various shape, hav- ing a longer or shorter stalk ; its wall consists of a single layer of cells which contain chloroplastids when young ; in- ternally it consists of very numerous small cells, each of which eventually gives rise to a single spermatozoid.
The spermatozoid is a cell, consisting of a naked filament of protoplasm, spirally twisted, thickened at the posterior end where lies the nucleus, t...apering at the anterior end where it terminates in two long cilia by means of which it swims (see p. 1 16) ; the spermatozoids ai*e set free by the rupture of the antheridial wall, which usually takes place at the apex of the antheridium.
The archegoiiium is flask-shaped and shortly stalked (Figs. 235, 236) ; it con- sists of a slightly dilated basal portion, the venter, and of a long slender neck.
The axis of the archegonium, when young, is occupied by a central row of cells ; the basal cell of this row, lying in the venter, is the central cell of the archegonium ; it grows consider- ably, and event- ually divides into two unequal parts, an upper and smaller, the ventral canal' cellf and a lower and larger which is the female reproductive cell or oosphere: the upper cells of the Digitized by Google GROUP II.
What to read after A Student's Text-Book of Botany?
You can find similar books in the "Read Also" column, or choose other free books by Vines, Sydney Howard, 1849-1934 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The sexual organs are always malti- CftUalar. The antheridlum (Figs. 233, 234) is a capsule of various shape, hav- ing a longer or shorter stalk ; its wall consists of a single layer of cells which contain chloroplastids when young ; in- ternally it consists of very numerous small cells, each of which eventually gives rise to a single spermatozoid.
The spermatozoid is a cell, consisting of a naked filament of protoplasm, spirally twisted, thickened at the posterior end where lies the nucleus, t...apering at the anterior end where it terminates in two long cilia by means of which it swims (see p. 1 16) ; the spermatozoids ai*e set free by the rupture of the antheridial wall, which usually takes place at the apex of the antheridium.
The archegoiiium is flask-shaped and shortly stalked (Figs. 235, 236) ; it con- sists of a slightly dilated basal portion, the venter, and of a long slender neck.
The axis of the archegonium, when young, is occupied by a central row of cells ; the basal cell of this row, lying in the venter, is the central cell of the archegonium ; it grows consider- ably, and event- ually divides into two unequal parts, an upper and smaller, the ventral canal' cellf and a lower and larger which is the female reproductive cell or oosphere: the upper cells of the Digitized by Google GROUP II.
What to read after A Student's Text-Book of Botany?
You can find similar books in the "Read Also" column, or choose other free books by Vines, Sydney Howard, 1849-1934 to read onlineMoreLess
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