Elementary botany . Fig. spores in mothercells (Polypodium vulgare). Fig. 4°3-Spores just mature and wall ofmother cell broken (Asplenium bul-biferum). mother cells are formed as a last division of the fertiletissue (archesporium) of the sporangium. In ordinary cell di-vision the nucleus always divides prior to the division of the many cases it is directly connected with the laying down ofthe dividing cell wall. 677. Direct division of the nucleus.—The nucleus divides intwo different ways. On the one hand the process is very nucleus simply fragments, or cuts itse
Elementary botany . Fig. spores in mothercells (Polypodium vulgare). Fig. 4°3-Spores just mature and wall ofmother cell broken (Asplenium bul-biferum). mother cells are formed as a last division of the fertiletissue (archesporium) of the sporangium. In ordinary cell di-vision the nucleus always divides prior to the division of the many cases it is directly connected with the laying down ofthe dividing cell wall. 677. Direct division of the nucleus.—The nucleus divides intwo different ways. On the one hand the process is very nucleus simply fragments, or cuts itself in two. This isdirect division. 678. Indirect division of the nucleus.—On the other handvery complicated phenomena precede and attend the division of 34o GAMETOPHYTE AND SPOROPHYTE. )4I the nucleus, giving rise to a succession of nuclear figures presentedby a definite but variable series of evolutions on the part of thenuclear substance. This is indirect division of the nucleus, orkaryokinesis. Indirect divi
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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
