A Students Text book of Botany
A Students Text book of Botany
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Salvinia) or less (e. G. Selaginella) through the ruptured outer coat of the macrospore.
Generally speaking, the symmetry of the prothallium is dorsi- ventral ; in the free-growing forms, the under surface generally bears numerous unicellular root-hairs. In some cases the pro- thallium shows more or less well-marked differentiation into a vegetative portion and a gametophore which may bear either both kinds of sexual organs, or, more commonly, one kind only ; when the gametophore bears only mal...e organs it is distinguished as an untheridiophore ; when only female organs, as an arche^joniopliore. The distribution of the sexual organs on the prothallium varies; they are frequently confined to one surface, but are occasionally scattered over the whole surface. The number of the sexual organs on a prothallium is in some cases only one, in others it is considerable.
The sexual organs are antheridia (male) and archegonia (female). The structure of the antheridium is simple ; it consists of a wall, a single layer of cells, enclosing the mother-cells of the spermato- zoids.
What to read after A Students 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:
Salvinia) or less (e. G. Selaginella) through the ruptured outer coat of the macrospore.
Generally speaking, the symmetry of the prothallium is dorsi- ventral ; in the free-growing forms, the under surface generally bears numerous unicellular root-hairs. In some cases the pro- thallium shows more or less well-marked differentiation into a vegetative portion and a gametophore which may bear either both kinds of sexual organs, or, more commonly, one kind only ; when the gametophore bears only mal...e organs it is distinguished as an untheridiophore ; when only female organs, as an arche^joniopliore. The distribution of the sexual organs on the prothallium varies; they are frequently confined to one surface, but are occasionally scattered over the whole surface. The number of the sexual organs on a prothallium is in some cases only one, in others it is considerable.
The sexual organs are antheridia (male) and archegonia (female). The structure of the antheridium is simple ; it consists of a wall, a single layer of cells, enclosing the mother-cells of the spermato- zoids.
What to read after A Students 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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