. Botany of the living plant. Botany. FILICALES 3^3 but it does not open except in presence of external fluid water. This causes swelling of the mucilaginous walls of the spermatocytes, and increased turgor of the cells of the wall. The tension is relieved by rupture of the cell covering the distal end, and the spermatocytes art- extruded into the water ; in this the cells of the wall assist by their. Fig. 284. I, an attenuated male prothallus of Nephrodium Filix-mas. 2-5, stages of develop- ment of the antheridium. 6, 7, ruptured autheridia. 8, a spennatozoid highly magnified. (After Kny.) sw
. Botany of the living plant. Botany. FILICALES 3^3 but it does not open except in presence of external fluid water. This causes swelling of the mucilaginous walls of the spermatocytes, and increased turgor of the cells of the wall. The tension is relieved by rupture of the cell covering the distal end, and the spermatocytes art- extruded into the water ; in this the cells of the wall assist by their. Fig. 284. I, an attenuated male prothallus of Nephrodium Filix-mas. 2-5, stages of develop- ment of the antheridium. 6, 7, ruptured autheridia. 8, a spennatozoid highly magnified. (After Kny.) swelling inwards, and consequent shortening (Fig. 284, O). The spermatocytes thus extruded into the water which caused the rupture, soon show active movement, and the spermatozoid which had already been formed within each of them escapes from its mucilaginous sheath, and moves freely in the water by means of active cilia attached near one end of its spirally coiled body (Fig. 284, 8). The archegonium also originates from a single superficial cell, and grows out so as to project from the downward surface of the thallu«.. 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 Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
