. Plant studies; an elementary botany. Botany. 254 PLANT STUDIES The other group, represented by Funis (Fig. 221), pro- duces no asexual spores, but is heterogamous. A single oogonium usually forms eight eggs (Fig. 221, vl), which are discharged ami float freely in the water (Fig. 221, E). The antheridia (Fig. 221, (') produce nuiucrous minute laterally biciliate sperms, which are discharged (Fig. 221, (i), swim in great numbers about the large eggs (Fig. 221, F, //), and finally one fuses with an egg, and an oospore is formed. As the sperms swarm very actively aljout the egg and im- pinge aga
. Plant studies; an elementary botany. Botany. 254 PLANT STUDIES The other group, represented by Funis (Fig. 221), pro- duces no asexual spores, but is heterogamous. A single oogonium usually forms eight eggs (Fig. 221, vl), which are discharged ami float freely in the water (Fig. 221, E). The antheridia (Fig. 221, (') produce nuiucrous minute laterally biciliate sperms, which are discharged (Fig. 221, (i), swim in great numbers about the large eggs (Fig. 221, F, //), and finally one fuses with an egg, and an oospore is formed. As the sperms swarm very actively aljout the egg and im- pinge against it they often set it rotating. Both antheridia and oogonia are formed in cavities of the thallus. 4. Ehodopiiyce.'e {Red Algw) 172. General characters.âOn account of their red colora- tion those forms are often called Floriili'w. They are mostly marine forms, and are anchored by holdfasts of various kinds. They belong to the deepest waters in which Alga; grow, and it is jjrDljable that the red coloring matter which character- izes them is associated with the dejith at which they live. The Eed Alga? are also a high- ly specialized line, and will be mentioned very briefly. 173. The plant body. â The lied Alga-, m general, are more deli- cate than the Ih'owii Alg:T3, or kel])s, their graceful forms, delicate texture, and brightly tinted bodies (shades of red, violet, dark Fifi. 2W. A red ali; Itraiirhiiio; liiibit, AftCT SCIIENCK. iiid â â fruit ,"â. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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