. Dansk botanisk arkiv. Plants; Plants -- Denmark. 184 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. my plant has just a fairly regularly dichotomous ramification, and the angle between the branches is often obtuse. Judging from Yendo's figure (1. c, pi. IV, fig. 4) the Japanese plant seems also to be more irregularly ramified and to form more compact tufts than the West Indian one. As to the anatomy I found it agreing very well with M™^ Weber's excellent description. In the joints the central strand consists of two rows of long cells, alternating regularly with one row of short cells. The long cells ha
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 184 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. my plant has just a fairly regularly dichotomous ramification, and the angle between the branches is often obtuse. Judging from Yendo's figure (1. c, pi. IV, fig. 4) the Japanese plant seems also to be more irregularly ramified and to form more compact tufts than the West Indian one. As to the anatomy I found it agreing very well with M™^ Weber's excellent description. In the joints the central strand consists of two rows of long cells, alternating regularly with one row of short cells. The long cells have a length of about 100//, the short ones of about 20// only. The cortical tissue consists of several layers of short cells, shortest at the periphery. In the young thallus the cortex consists only of a few layers of cells, in the older one, on the other hand, of several, because the cortical layer increases, as the plant grows older, in thickness (comp. Solms- Laubach, 1. c). As mentioned by this investigator and described more particularly by M™^ Weber the nodes of Amphiroa rigida consist of two rows of cells (Fig. 173). The cells in these rows are of nearly the same size and have thick walls, except in the upper and lower ends where they meet the cells of the central strand. Here the transverse walls are horizontally placed while the cells in the middle of the node meet each other with oblique walls, being in this way more firmly connected. As suggested by M™*^ Weber this might, perhaps, help to increase the strength of the node. A good illustration of the node is given by Yendo in "Corallinæ veræ Japonicæ", pi. 1, figs. 5—6. To judge from Harvey's description of Am- phiroa fragilissima in Nereis, part II, p. 85 the plant he has had before him seems to be the same as the present one. Harvey's description seems in any case quite to agree with my plant; but, in order to settle exactly their identity, an examination of Harvey's plant is of course necessary
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