. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. 504 BULLETIN OF THE BUREAU OF FISHERIES. above, branches sometimes elongated and somewhat zigzag, gradually tapering, and divided into nimier- ous fine branchlets toward the apices, branchlets arising laterally, often forming dense fastigiate tufts, especially toward the apices; pericentral cells six to eight, usually six, rarely five, segments i diameter long or less below, 2 to 3 diameters above, no cortex; tetrasporangia in somewhat torulose series in the branchlets; antheridia linear-oblong, acute at apices; cystocarps broad-o
. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. 504 BULLETIN OF THE BUREAU OF FISHERIES. above, branches sometimes elongated and somewhat zigzag, gradually tapering, and divided into nimier- ous fine branchlets toward the apices, branchlets arising laterally, often forming dense fastigiate tufts, especially toward the apices; pericentral cells six to eight, usually six, rarely five, segments i diameter long or less below, 2 to 3 diameters above, no cortex; tetrasporangia in somewhat torulose series in the branchlets; antheridia linear-oblong, acute at apices; cystocarps broad-ovate, toward the apices of small branches; color dark brownish or blackish purple. Warm and temperate North Atlantic. Occasionally abimdant on buoys, Beaufort, N. C., July to September, sometimes fruiting. One mass on buoy in Soimd, Port Royal, S. C, and very abimdant on Gracilaria muliipartita var. angustissima at mouth of one creek, August, Fig. 36.—Chandria tiUorali!, apex of branch, X 40. Fig. 37.—Chondria Uttoralts (?), apex of branch. X 40. Fig. 3S.—CItondriu dasyphylla, apex of branch. X 40. Fig. 39.—Chondria dasyphylla, anthreiditim. X 157. Fig. 40.—Chondria dasyphylla, young plants. X 157. Fig. 41.—Polysiphonia cross sections of stems. A. P. haneyii. B. P. denuJala. C. P. nigrescens. X 40. Fig. 42.—Spcrmothamnion investicns, partly divided tetra- sporangium producing vegetative filament, X 263. Fig. 43.—Griffithsia sp. X 40. This is the only detenninable species having six pericentral cells observed in tliis region. The habit, while more or less dense, is characteristic, and the determination is less difficult than in most species of the genus. The plants growing on the buoys are small (2 to 4 cm.), while those from the creek at Port Royal are 6 to 15 cm. tall. According to Harvey, this species is very abimdant in the harbor of Charleston, S. C, dtU"ixig January and February. 4. Polysiphonia nigrescens (Hudson) Greville. Fig. 41C; PI.
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