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P:l.,cejl..aph. 1. HYDROPHYTE. 16. Conjug. sm
Ponds; August. .
Tiifls thick, dark green, floating ; threads as thick as a
horse-hair; transijerse tulles very short.
XVII. 17. CHOASPIS. Choaspis.
Tkallus threadlike, simple, tubular, jointed, kneebent;
coupling at the bend, b}' a perforation in each joint, which
transmits the granules from one plant to the other, where
they form an elliptic spore ; granules scattered. — Not
slippery.
Choaspis serpentina. Serpentine choaspis.
Threads slender, stiffs here and there slightly bent, ao^
coupling; joints four times as long as broad; granules in a
triple irregular series.
Conferva stictica, Engl. Bot. 2463.
Ditches.
Tufts floating, pale yellowish green above^ blackish
green beneath ; joints when young pale green.
XVIII. 18. AGARDHIA. ylgmdh.
Thallus threadlike, simple, tubular, jointed, bent, approximating
and uniting here and there with others, the
.coupled joints becoming shortened; granules in a single
Jine, spore formed in the shortened couple(;l joints, cr