. Elementary botany. Botany. Fig. 313- Forming spores in mother cells (Polypodium vulgare). Kg. 314- Spores just mature and wall of mother cell broken (Asplenium bul- biferum). mother cells are formed as a last di\'ision of the fertile tissue (archesporium) of the sporangium. In ordinary cell di- vision the nucleus always divides prior to the di\"ision of the cell. In many cases it is directly connected with the laying down of the dividing cell wall. 470. Direct division of the nucleus.—The nucleus divides in two different ways. On the one hand the process is very simple. The nucleus simp
. Elementary botany. Botany. Fig. 313- Forming spores in mother cells (Polypodium vulgare). Kg. 314- Spores just mature and wall of mother cell broken (Asplenium bul- biferum). mother cells are formed as a last di\'ision of the fertile tissue (archesporium) of the sporangium. In ordinary cell di- vision the nucleus always divides prior to the di\"ision of the cell. In many cases it is directly connected with the laying down of the dividing cell wall. 470. Direct division of the nucleus.—The nucleus divides in two different ways. On the one hand the process is very simple. The nucleus simply fragments, or cuts itself in two. This is direct division. 471. Indirect division of the nucleus.—On the other hand very complicated phenomena preCede and attend the division of 239. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atkinson, George Francis, 1854-1918. New York, H. Holt
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