. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 377. few branches of quite the same shape as their own; sometimes it may happen that such a branch is given off from the blunt apex of the mother branch. The plant has a fine, clear-rose colour; it is somewhat dia- phanous, of a fleshy succulent consistency. When dry it collapses completely, and it adheres mostly very well to the paper. A trans- verse section (Fig. 365 c) shows that the greater part of the tissue consists of large, transpa- rent and thin-walled cells; out- wards these become sm
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 377. few branches of quite the same shape as their own; sometimes it may happen that such a branch is given off from the blunt apex of the mother branch. The plant has a fine, clear-rose colour; it is somewhat dia- phanous, of a fleshy succulent consistency. When dry it collapses completely, and it adheres mostly very well to the paper. A trans- verse section (Fig. 365 c) shows that the greater part of the tissue consists of large, transpa- rent and thin-walled cells; out- wards these become smaller and they are surrounded by a corti- cal layer consisting of one or two layers of rather small, thick-wal- led cells. Seen from the surface the cortical cells are irregularly polygonal (Fig. 365 B). In the tetrasporic plant the tetrasporangia occur scattered or in small irregular groups in the cortical layer (Figs. 365 B, C). The tetrasporangia are round- ish of shape, their diameter reaching a length of about 40 fi. The female plant bears the warty, dark-red cystocarps scat- tered over the surface. The plant does not seem to approach any known Gracilaria. From Gracilaria Blodgetti it differs especially by the scarcer rami- fication and the obtuse apices of the branches. The plant was found with tetraspores and cystocarps in the month of March. It was dredged in deep water about 10—15 fathoms. The Callithamnion cordatum is a common and characteri- stic epiphyte upon this Gracilaria. St. Jan.: Found in many places in the sound between this island and St. Thomas; and in the sea to the north of America Hill. Fig. 365. Gracilaria cylindrica nov. spec. A, transverse section of the thal- lus (about 8:1); B, surface of the thallus with tetraspores; C, trans- verse section of epidermal layer with tetraspores. {B and C about 80:1).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appeara
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