. Dansk botanisk arkiv. Plants; Plants -- Denmark. 218 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. The antheridial stands (Fig. 203 E, F) are found at the same places as the tetrasporangia; they consist of a system of closely placed, short branches, of which each bears 2—4 antheridia. The cystocarps (Figs. 202, 203 G, 204) are binate and trilo- bed heart-shaped, sometimes also more irregularly formed. The younger and smaller ones consist only of a single layer of carpo- spores (Fig. 203 K), but in the bigger cystocarps and especially in the more irregularly shaped several layers are also present. The
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 218 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. The antheridial stands (Fig. 203 E, F) are found at the same places as the tetrasporangia; they consist of a system of closely placed, short branches, of which each bears 2—4 antheridia. The cystocarps (Figs. 202, 203 G, 204) are binate and trilo- bed heart-shaped, sometimes also more irregularly formed. The younger and smaller ones consist only of a single layer of carpo- spores (Fig. 203 K), but in the bigger cystocarps and especially in the more irregularly shaped several layers are also present. The carpogonial branch is four-celled and possesses a very long trichogyne (Fig. 203 /). The plant occurred as a com- mon epiphyte on Gracilaria Blodgetti and was found only in deeper water (about 15 fat- homs). It was collected \V\i\\ tetraspores, antheridia and cystocarps in the month of March. Occurred in many places in the sound between St. Tliomas and St. Jan: off Cruz Bay. Geogr. Distrib.: Hitherto found only in theabove mentioned Fig. 204. Callithamnion cordatum Borgs. Branch with cystocarps and a single tetrasporangium (50:1). 2. Callitbaranion byssoides Arn. Arnott in Hooker, English Flora, vol. II, part I, 1833, p. 342 (Algæ by Harvey). Harvey, Manual, 1849, p. 178; Phycol. Brit, pi 262. Are- scHouGH, I. E., Phyceae Scandin. Marinae, 1850, p. 107, pi. V, B. Cfr. Schmitz, Fr., in Berichte d. deutsch, bot. Ges., Bd. XI, 1893, p. 280. Børge- sen, F., Some new or little known West Indian Florideæ (Bot. Tidsskr., vol. 30, 1909, p. 11). Regarding a comparison of the West Indian form with plants from other countries I refer to my remarks, 1. c. Here I shall restrict myself to give a short description only of the West In- dian plant (Fig. 205). It has a rather vigorous main stem whose cells are about 3—4 times as long as broad (lat. cell. = 140//); higher up the cells grow thinner and thinner, the youngest tips of the branches being only 9—10// thick. The branc
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