. Botany for high schools and colleges. Botany. (BDOGONIE^. 247 329.âThe asexual reproduction of (Edogoniese is as curi- ous as the growth of its cells, just described. During the early and active growth of the plants the protoplasmic contents of certain cells in a filament become detached from their walls, and upon the splitting of the latter the now rounded protoplasm escapes as a large zoospore (Fig. 166, A and B); it is OTal in shape, and provid- ed with a crown of cilia about its smaller hyaline end, by means of which it swims rapidly hither and thither in the water (Fig. 166, G). After a
. Botany for high schools and colleges. Botany. (BDOGONIE^. 247 329.âThe asexual reproduction of (Edogoniese is as curi- ous as the growth of its cells, just described. During the early and active growth of the plants the protoplasmic contents of certain cells in a filament become detached from their walls, and upon the splitting of the latter the now rounded protoplasm escapes as a large zoospore (Fig. 166, A and B); it is OTal in shape, and provid- ed with a crown of cilia about its smaller hyaline end, by means of which it swims rapidly hither and thither in the water (Fig. 166, G). After a time it comes to rest, clothes itself with a cell-wall, and sends out from its smaller end root- like prolongations (Fig. 166, D), which attach it to some object; it now elongates, and at length forms partitions, taking on eventually the form of the adult filament. It sometimes happens that before the new plant resulting from the growth of a zoospore has formed its first partition, the protoplasm sep- arates from its wall and again aban- dons it, to be for a time a zoospore (Fig. 166, E). This method of formation of zoospores is what Braun called Eejuvenescence. (See p. 43.) 330. of the 1 1 1 iTjixii. terminal. D. zoospore at rest, many respects closely allied to that and sendlnir out root like pro. .of Sphwroplea. The female organs I^r^'^ou^nf °pTa,5?\X-edâ¢o'f are in all cases developed in essen- es^inr x'm-Af'terP?iS|" tially the same way, but the male ''^â¢- -organs present a considerable diversity. The female organ. Pig. 166. â Asexnal reproduce tion of (Edogonium. A, fracture of a filament and escape of the protoplasm of the broken cell; the protoplasm in the whole eel] below is seen to be somewhat withdrawn from the cell-wall, preparatory lo escaping. £, es- cape of protoplasm and formation of a zoospore; the hyaline por- The sexual reproduction tlon of the latter is seen to be lat- T , j» XT ⢠1 â ⢠^^^^- ^> 3, ciliated and swimming plants
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
