. Dansk botanisk arkiv. Plants; Plants -- Denmark. 120 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. Found in several places at St. Jan in the sound between this island and St. Thomas where it seems to be common. 3. Wrangelia pcnicillata C. Ag. Agardh, C, Spec. Alg. II, p. 138. Agardh, J., Spec. Alg. II, pars III, p. 708; Epicrisis, p. 623. Derbes et Solier, Memoire, p. 71, pi. 18, figs. 6—8. KüTziNG, Spec, p. 664. Harvey, Nereis , Part 11, p. 143, tab. 34 B. BoRNET et Thuret, Notes algologiques, Fasc. II, 1880, p. 183. pi. 48. Zer- lang, O. E., Entwicklungsgesch, Untersuch, über die Florideen-G
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 120 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. Found in several places at St. Jan in the sound between this island and St. Thomas where it seems to be common. 3. Wrangelia pcnicillata C. Ag. Agardh, C, Spec. Alg. II, p. 138. Agardh, J., Spec. Alg. II, pars III, p. 708; Epicrisis, p. 623. Derbes et Solier, Memoire, p. 71, pi. 18, figs. 6—8. KüTziNG, Spec, p. 664. Harvey, Nereis , Part 11, p. 143, tab. 34 B. BoRNET et Thuret, Notes algologiques, Fasc. II, 1880, p. 183. pi. 48. Zer- lang, O. E., Entwicklungsgesch, Untersuch, über die Florideen-Gatt. Wran- gelia und Naccaria (Flora, 47, 1889, p. 371). G/iffithsia penicillata Agardh, Systema Alg., p. 143. Dasya spinella Duby, Second memoire sur le groupe des Céramiées, p. 13, tab. II, figs. 3, 4, 5 and tab. Ill, ligs. 1, 2. In the West Indian seas this plant attains a great size especially when it is growing in deep water. Several of the specimens reach a height of 20 cm or even more. The specimens growing in shal- low water are smaller and more robust and more like the Euro- pean specimens while the speci- mens from deep water are more flabby, thinner and in all re- spects more elongated. As to the American form see Harvey, 1. c, where a description and good figures of this plant are found. Zerlang has 1. c. given a very detailed description of the development and structure of this plant to which the reader is referred. I shall only mention briefly that the main filaments in an early stage of development become bare at their base while higher up they carry the verticillate branchlets at each joint. From each of these whorls a smaller branch issues and these branches are regularly alternating. Some of these branches grow out mto long branches and serve to form the ramification of the thallus, most of them in the sterile plant soon die away and fall off; in the fertile plant, on the other hand, they carry the organs of fertilization and last longer. The branchlets
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