. Dansk botanisk arkiv. Plants; Plants -- Denmark. 216 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. Je n'ai pas vu de cystocarpes". Perhaps she has had the pre- sent plant before her. The plant was dredged in deep water in a depth of about 30 meters. St. Jan: Off Annaberg. Subfam. 4. Callithamnieæ. Callithamnion Lyngb. 1. Callithamnion cordatum Børgs. Børgesen, F., Some new or little known West Indian Florideæ (Bot. Tidsskrift, vol. 30, 1909, p. 10). This plant is an epiphyte forming small, rosy, shrub-like tufts upon the host plant. It is not corticated; however, from the basal cells of the vigor
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 216 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. Je n'ai pas vu de cystocarpes". Perhaps she has had the pre- sent plant before her. The plant was dredged in deep water in a depth of about 30 meters. St. Jan: Off Annaberg. Subfam. 4. Callithamnieæ. Callithamnion Lyngb. 1. Callithamnion cordatum Børgs. Børgesen, F., Some new or little known West Indian Florideæ (Bot. Tidsskrift, vol. 30, 1909, p. 10). This plant is an epiphyte forming small, rosy, shrub-like tufts upon the host plant. It is not corticated; however, from the basal cells of the vigorous branches in the lower-most part of the thallus a single long rhizoid is often developed. It grows do\NTiwards along the wall of the large cells in the main stem (Fig. 201). These rhizoids are composed of nearly cylindrical cells about 150 fi long and 25 ft broad. The frond reaches a height from 2—4 cm. ; the main stem is at the bottom part nearly straight with few branches, becoming more flexuous and richly ramified higher up; near the top the main axis disappears (Fig. 202). The base (Fig. 203 A) consists of short cells, their walls often reaching a thickness of 18/j or more, the diameter of the whole cell measuring about 200/i. From the cells near the base rhizoids grow down- wards and assist in fixing the plant. Higher up in the main stems the cells grow longer becoming at the same time thinner, at first twice as long as broad (long. cell. = 300^; lat. cell. = 160^), and then nearer the top 5—8 times as long as broad (long. cell. = 400//; lat. cell. ^= bOju). The uppermost branches are much thinner, only S/j. thick; they are often arch-shaped and bent inwardly (Fig. 204). The ramification is alternate, in the upper part subdichotomous. In my previous description I have said that hairs, as a rule, are absent; this is the case, too, in the older part of the thallus. Fig. 201. Callitham- nion corda- tum Borgs. Rhizoid growing out from base of a brancli. (About 170 :
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