. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 105 lected by Ørsted. St. Jan.: Coral Bay, and in the sound between St. Thomas and St. Jan near the island St. James. Geogr. Distrib.: West Indies. Sectio III. Euffalaxauva (Dcsne) Kjellm. 8. Cralaxaura fragilis (Lamk.) Kütz. KüTziNG, Spec, p. 530. Kjellman, F. R., Floridé-slagtet Galaxaura, p. 60. Dichotomaria fragilis Lamk. Lamarck, J., Histoire naturelle des ani- maux sans vertebres, t. II, 1816, p. 145. The specimens (Fig. 112) have a glabrous, when dry often shining surface. The annulation
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 105 lected by Ørsted. St. Jan.: Coral Bay, and in the sound between St. Thomas and St. Jan near the island St. James. Geogr. Distrib.: West Indies. Sectio III. Euffalaxauva (Dcsne) Kjellm. 8. Cralaxaura fragilis (Lamk.) Kütz. KüTziNG, Spec, p. 530. Kjellman, F. R., Floridé-slagtet Galaxaura, p. 60. Dichotomaria fragilis Lamk. Lamarck, J., Histoire naturelle des ani- maux sans vertebres, t. II, 1816, p. 145. The specimens (Fig. 112) have a glabrous, when dry often shining surface. The annulation which in some of the specimens determined by Kjellman was very prominent was not so distinct in my plant. The branches are fairly regularly dichtomously forked. The internodes are 4—5 mm long, mostly slender at their base growing thicker upwards, more rarely nearly cylindrical; at their base an annular bursting of the calcareous layer is often present. The colour of the dried plant is light yellow green often also more reddish. The whole plant is very fragile. A transverse section reveals the fact pj^. ^^^ Galaxaura fragilis that the medullary tissue is very (Lamk). Transverse section of loose; it consists of dichotomously t^e thallus. (About 250:1). ramified, rather thick-walled fila- ments running between each other; their diameter is about 8 /j. long. The diaphragms at the joints the presence of which espe- cially characterizes the Sectio Eugalaxaura are formed in the following manner. Numerous filaments are crowded more firmly together and furthermore the ends of these filaments are much thickened, their diameter reaching often lip. or more (Fig. 113 6). The peripheral tissue (Fig. 114) is about 70// thick. It consists of short, dichotomously branched filaments the cells of which form together a parenchymatous tissue; with the except- ion of the epidermal cells, all other cells in this tissue are easily separable after decalcification. The innermost cells are the l
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