. Plant studies; an elementary botany. Botany. Fig. 210. Vayrht-ria ^es.^'/lh. a Siphon fnrm, showing a portion of the ca-nocytic lioilv, an antheridial hraiich {.4) with an empty antln.'- ridinm ia) at its tip; and an oogonium {]>) containing an oospore ic) and showing tlte opening (/) through which the sperms passed to reach the egLr.— develops a perforated break for the entrance of the si)erms, and organizes within itself a single large egg (Fig. 210, B). The an- theridium is a much smaller cell, within which numerous very small sperms are formed (Fig. 210, A,i(). The sjierms a
. Plant studies; an elementary botany. Botany. Fig. 210. Vayrht-ria ^es.^'/lh. a Siphon fnrm, showing a portion of the ca-nocytic lioilv, an antheridial hraiich {.4) with an empty antln.'- ridinm ia) at its tip; and an oogonium {]>) containing an oospore ic) and showing tlte opening (/) through which the sperms passed to reach the egLr.— develops a perforated break for the entrance of the si)erms, and organizes within itself a single large egg (Fig. 210, B). The an- theridium is a much smaller cell, within which numerous very small sperms are formed (Fig. 210, A,i(). The sjierms are discharged, swtirm about tire oogonium, and finally one passes tlirough the break and fuses with tlio egg, the residt lie- ing an oospore. The oospore or- ganizes a thick wall and becomes a resting spore. It is evident that V((uc]ii'riii is hetcrogamous, but till the other Sijihon forms are isogamoiis, of which Btilnidiiim may be taken as tin illustration (Fig. 211). 1(17. Spirogyra.—This is one of the commonest of the "pond scums," occurring in slippery and often frotliy masses of delicate filaments llotiting in still water or about , ^11. JUttryd'vnii, one of tile Siplion forms of green ali:;p, tlie whole body con- taining one eoiitinnons cav- ity, \:itli a Inillious, ehioro- jiliyll -ecuitaining ])ortion, and root-iilic liranches wliieh jienetrate the mud in wliieli the i)Iaiit gro\\s. — 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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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1900
