Text-book of structural and physiological botany . d, in consequence of their natural affi-nity, to a class in which they could not be included if its distinguishingcharacteristics were rigidly interpreted. If, however, in such a case theprinciple of the classification were to be rigidly enforced, we shouldfall into the greater evil—because still more opposed to the idea of anatural system—of separating arbitrarily what are naturally the best natural system must, therefore, be either not altogethersystematic, or must be unnatural, because any systematic attempts to con-strain free
Text-book of structural and physiological botany . d, in consequence of their natural affi-nity, to a class in which they could not be included if its distinguishingcharacteristics were rigidly interpreted. If, however, in such a case theprinciple of the classification were to be rigidly enforced, we shouldfall into the greater evil—because still more opposed to the idea of anatural system—of separating arbitrarily what are naturally the best natural system must, therefore, be either not altogethersystematic, or must be unnatural, because any systematic attempts to con-strain free Nature in the fetters of an arrangement which is foreign toher, must leave out of account tire numerous transitional forms whichoccupy intermediate places between the principal types. special Morphology and Classification. 247 CRYPTOGAMIA, OR FLOWERLESS PLANTS. Class I. AlgcE, The Algae include some of the smallest and simplestforms of vegetable life, rising in other instances to a highdegree of organisation and considerable dimensions. Some. Fig. 380.—Caulerpa taxifolia, a marine Unicellular Alga (natural size). species of Palmella have a diameter of only 0001 to 0002mm., while Macrocystis attains a ength of 300 metres or more. 248 Structural and Physiological Botany, The important points of distinction between the differentforms depend either on the degree of development of theindividual cells, or on the mode in which they among the Unicellular Algae the greatest variety offorms is found, from the globular Pleurococcus (Fig. 59,p. 37), and the rooting spherical cell of Botrydium (Fig. 81,p. 55), to the species of Caulerpa (Fig. 380) of tropical seas,two feet in length, and simulating the appearance of stem,leaves, and roots. Sometimes the single cell branchescopiously, its branches becoming most intimately connectedwith one another in such a peculiar way that a tissue-likestructure is produced, as in Ccleochcete scutata, and a sectionthrough the whole pres
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