Elementary botany . ng gamete. 296. Position of the plant spirogyra.—From our study then we see thatthere is practically no differentiation among the vegetative cells, exceptwhere holdfasts grow out from some of the cells for support. They are allalike in form, in capacity for growth, division, or multiplication of thethreads. Each cell is practically an independent plant. There is no differ-entiation between vegetative cell and conjugating cell. All the cells arepotential gametes. Finally there is no structural differentiation between thegametes. This indicates then a simple condition of thin
Elementary botany . ng gamete. 296. Position of the plant spirogyra.—From our study then we see thatthere is practically no differentiation among the vegetative cells, exceptwhere holdfasts grow out from some of the cells for support. They are allalike in form, in capacity for growth, division, or multiplication of thethreads. Each cell is practically an independent plant. There is no differ-entiation between vegetative cell and conjugating cell. All the cells arepotential gametes. Finally there is no structural differentiation between thegametes. This indicates then a simple condition of things, a low grade oforganization. 297. The alga spirogyra is one of the representatives of the lower algaebelonging to the group called Conjugate. Zygnema with star-shaped chloro-plasts, mougeotia with straight or sometimes twisted chlorophyll bands, be-long to the same group. In the latter genus only a portion of the protoplasmof each cell unites to form the zygospore, which is located in the tube betweenthe Fig. 133-Micrasterias.
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