. Botany of the living plant. Botany. LYCOPODIALES .S2I The germination of both types of spores may begin before they are shed, but it is continued on the moist soil. The microspore first partitions off a lenticular cell, which is vestigial like those in tlic pollen-grains of Pinus, representing a male prolhalhis. The rest of the contents segment to form a wall of eight sterile cells surrounding a numerous group of spermatocytes (Fig. 264, /]). A mucilaginous change appears in the walls of these latter cells. Meanwhile their protoplasts form each a single curved spermatozoid, motile in water b
. Botany of the living plant. Botany. LYCOPODIALES .S2I The germination of both types of spores may begin before they are shed, but it is continued on the moist soil. The microspore first partitions off a lenticular cell, which is vestigial like those in tlic pollen-grains of Pinus, representing a male prolhalhis. The rest of the contents segment to form a wall of eight sterile cells surrounding a numerous group of spermatocytes (Fig. 264, /]). A mucilaginous change appears in the walls of these latter cells. Meanwhile their protoplasts form each a single curved spermatozoid, motile in water by two cilia. Swelling of the mucilage by water bursts the wall of the spore, and the spermatozoids escape (Fig. 264, B). The germination of the megaspores produces an internal tissue of greater extent, which may be styled the female protliallus. Its develop-. 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
