Chambers's encyclopaedia; a dictionary of universal knowledge . of the Plueosporece the zooganietes arenioriihologically in-distinguishable, in-teresting gradationsmay be observed insome genera wherethe zooganietes areditlerentiated intomale and female is especiallyinteresting in this re-spect, as the femalegametes are niuchlarger than the malegametes, and cometo rest before con-jugation with tlie stillmotile male cell. The Fucacete arecharacterised by having distinctlyditlerentiated sexualorgans with non-motile ova andmotile fertilising cells. The ova areformed within theswolle
Chambers's encyclopaedia; a dictionary of universal knowledge . of the Plueosporece the zooganietes arenioriihologically in-distinguishable, in-teresting gradationsmay be observed insome genera wherethe zooganietes areditlerentiated intomale and female is especiallyinteresting in this re-spect, as the femalegametes are niuchlarger than the malegametes, and cometo rest before con-jugation with tlie stillmotile male cell. The Fucacete arecharacterised by having distinctlyditlerentiated sexualorgans with non-motile ova andmotile fertilising cells. The ova areformed within theswollen cells {oor/o-j//(0 ^^hicli arise fromthe wall of tiask-shaped cavities (coHcc/i/ac/cs), and are accompaniedby unbranclied hairs. The fertilising cell-*, aiithero-zoids or sperms, are produced in ovoid terminalcells of branched hairs (dtillieridia), which likewisearise from the walls of similar conceiitades. InFunis j)/iifi/r(irpiis both ova and sperms are formedin the same conceptacle; in most Fucaceje, how-ever, they are formed on ditterent plants. Asexual. Fig. 3.—Fucus platycarpus :A portion of the tlialhis show-ing receptacles (x J). (AfterTliuret.)
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondo, bookyear1901
