. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Borgesen: Rhodophyceæ of the Danish W. Indies. 193 the upper ends of the filaments are about 250//. long and about 80/i broad in the middle. The antheridial and cystocarpic conceptacles occur together in the same plant (Fig. 181), while the tetrasporic conceptacles occur in separate plants. As pointed out by Hauck (1. c.) the tetrasporic and female conceptacles are developed in the basal joint in the uppermost dichotomy. This joint is cuneate of shape ; it is large, of very variable length, often more than 800/^ long; the breadth, at the up
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Borgesen: Rhodophyceæ of the Danish W. Indies. 193 the upper ends of the filaments are about 250//. long and about 80/i broad in the middle. The antheridial and cystocarpic conceptacles occur together in the same plant (Fig. 181), while the tetrasporic conceptacles occur in separate plants. As pointed out by Hauck (1. c.) the tetrasporic and female conceptacles are developed in the basal joint in the uppermost dichotomy. This joint is cuneate of shape ; it is large, of very variable length, often more than 800/^ long; the breadth, at the upper end, where the conceptacles are found, seems on the other hand less variable, about 250/i. In the tetrasporic conceptacles (Fig. 182) the hornlike prolongations at both sides of the conceptacles mostly consist of two nearly cylindri- cal joints, while in the female concep- tacles these horns consist only of a single joint. But having seen so very few plants I dare not say that this is always the rule ; in the female conceptacle the joints in the horn are about 60—70// broad and about 300/i long, while in the tetrasporic the lowest joint in the horns is about 70 fi broad and 400/« long, the upper joint a little thinner and shorter, about 230/« long. The joint with the antheridial conceptacles are ovate—spindleshaped and of smaller size than the tetra- sporic and female conceptacles; they are about 250« long and 140// broad. They are formed in the uppermost joint of a branch; the few antheridial filaments I have seen in the form from this locality have all been short, consisting only of the antheridial joint or, besides, of a single vegetative joint below. While I have had very few specimens growing upon Turbi- naria at my disposal, I have collected a specimen of Zonaria lobata at the shores of St. Croix upon which numerous specimens of this small Jania were present (Fig. 183). Unfortunately the exact locality of this plant is not known, but most probably it. Fig. 182
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