. A handbook of cryptogamic botany. Cryptogams. FLORIDE^ 193 tissue into epidermal, assi- milating, and conducting systems, still there are, in the higher forms, cells which are especially concerned with assimilation, and which may be either isodiame- trical, or elongated in either direction. Such assimilat- ing tracts are classed by Wille under three heads, viz.:—(i) those which act also for purposes of con- ducting ; (2) those which are altogether distinct from the conducting cells; and (3) those where, in addition to an assimilating, there are also primary and secondary conducting cells. In
. A handbook of cryptogamic botany. Cryptogams. FLORIDE^ 193 tissue into epidermal, assi- milating, and conducting systems, still there are, in the higher forms, cells which are especially concerned with assimilation, and which may be either isodiame- trical, or elongated in either direction. Such assimilat- ing tracts are classed by Wille under three heads, viz.:—(i) those which act also for purposes of con- ducting ; (2) those which are altogether distinct from the conducting cells; and (3) those where, in addition to an assimilating, there are also primary and secondary conducting cells. In some species the 'frond' assumes the appearance of a stalked leaf, as in Hydrolapathum (Rupr.) and Delesseria (Grev.), often of the most beautiful form, and present- ing even a rudimentary venation. The genera Melobesia (Lmx.), Hilden- brandtia, Cruoria, and some others, consist of small algse, mostly marine, with crustaceous or gelatinous thallus, growing flat on stones or larger algas, often of lichen-like appearance. In their mode of growth some Florideffi display bi- lateral symmetry, and the branching may be either monopodial or sympodial. In Polysiphonia, Spyridia. Fig. -lio.—Polysiphonia opaca Zan. a, with cystocarps ; b, with tetrasporanges (natural size); c, branch with tetrasporan^es; d, branch with cystocarp (x ioo)> (After Kxitzing.) O. 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 Bennett, Alfred W. (Alfred William), 1833-1902; Murray, George Robert Milne, 1858-. London, New York, Longmans, Green, and Co.
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