. Botany for high schools. Botany. 238 GENERAL MORPHOLOGY OF PLANTS wall of the conceptacle, each of which contains eight eggs. The eggs are set free by the rupture of the wall, and escape to the outside. The sperm cases are small elliptical bodies borne as branches on very much branched filamentous outgrowths from. Fig. 199. Fig. 200. Fig. 201. Antheridia of Fucus on Antheridia of Fucus with Eggs of Fucus surrounded branched threads. escaping sperms. by sperms. the wall. Each sperm case develops a large number of small biciliate sperms, which also escape to the outside in the sea water. Here
. Botany for high schools. Botany. 238 GENERAL MORPHOLOGY OF PLANTS wall of the conceptacle, each of which contains eight eggs. The eggs are set free by the rupture of the wall, and escape to the outside. The sperm cases are small elliptical bodies borne as branches on very much branched filamentous outgrowths from. Fig. 199. Fig. 200. Fig. 201. Antheridia of Fucus on Antheridia of Fucus with Eggs of Fucus surrounded branched threads. escaping sperms. by sperms. the wall. Each sperm case develops a large number of small biciliate sperms, which also escape to the outside in the sea water. Here they swim among and around the eggs, often causing them to revolve. One sperm finally enters and fuses with the egg nucleus. The fertilized eggs which reach favorable localities start to grow within a day and develop new rockweed plants. 383. Sargassum.—This is another rockweed which is inter- esting because of the large number of small bladder-like floats developed as lateral outgrowths, in addition to the thin blades and the reproductive branches. Sargassum is sometimes spoken of as gulf weed. Large numbers of them are broken away by the waves, from the rocks on the shores of the West Indies, and are carried by the gulf streams to the open sea between the 20th and 40th parallels of latitude, v/here they often accumulate in vast numbers, forming what are called '^Sargasso seas,'^ and some- times interfere with navigation. Here they grow^ vegetatively, but are not known to fruit under these 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 and Company
Size: 2167px × 1153px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
