. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . hon), or produced by the division of the contentsof the mother-cell by three or more sets of division-planes (Xenococcus, Hyella, Dur,,i-carpa). Order II. HoRMOGONE/E. Includes all the filamentous Myxophycese. The filaments consist of a simple row of cells, very raivly n;iU«d, and usually 42 MyxopliycesB enclosed within a sheath, which varies from a hyaline, indistinct envelope toa tough, coloured investment. In some instances several rows of
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . hon), or produced by the division of the contentsof the mother-cell by three or more sets of division-planes (Xenococcus, Hyella, Dur,,i-carpa). Order II. HoRMOGONE/E. Includes all the filamentous Myxophycese. The filaments consist of a simple row of cells, very raivly n;iU«d, and usually 42 MyxopliycesB enclosed within a sheath, which varies from a hyaline, indistinct envelope toa tough, coloured investment. In some instances several rows of cells occurwithin the same sheath. In most of the families heterocysts occur in moreor less abundance, but in the Oscillatoriacese and Camptotrichaceae they areabsent. In some genera the filaments are branched, and in others a peculiartype of false branching occurs. Most of the Algre in this group occurattached to a substratum. The plants multiply by means of hormogones,and more rarely by resting-spores. A. Psilonematese. Trichomes1 cylindrical, sometimes narrowed at theextremities, but never gradually attenuated towards the
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