. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies, 233 Geogr, Distrib.: Mediterranean Sea, warmer shores of the Atlantic Ocean. Subfam. 6. Spyridieæ. 1. Spyridia filamentosa (Wulf.) Harv. Harvey, W. H., in Hooker, Brit. Flora, vol. II, 1833, p. 336; Manual Brit. Alg., 1841, p. 101; Phycologia Britannica, pi. 46; Nereis , 1853, part II, p. 204. Agardh, J., Spec. Alg., vol. II, p. 340; Epicrisis, p. 268. Farlow, W. G., Mar. Alg. of New England, 1881, p. 140, pi. X, fig. 1 and pi. XII, fig. 2. Hauck, F., Meeresalgen, p. 115. De Toni, Sy
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies, 233 Geogr, Distrib.: Mediterranean Sea, warmer shores of the Atlantic Ocean. Subfam. 6. Spyridieæ. 1. Spyridia filamentosa (Wulf.) Harv. Harvey, W. H., in Hooker, Brit. Flora, vol. II, 1833, p. 336; Manual Brit. Alg., 1841, p. 101; Phycologia Britannica, pi. 46; Nereis , 1853, part II, p. 204. Agardh, J., Spec. Alg., vol. II, p. 340; Epicrisis, p. 268. Farlow, W. G., Mar. Alg. of New England, 1881, p. 140, pi. X, fig. 1 and pi. XII, fig. 2. Hauck, F., Meeresalgen, p. 115. De Toni, Sylloge Alg., vol. IV, sect. Ill, p. 1427 (ubi synomyna pluria). Fucus filamentosus Wulfen, Cryptogama aquatica in Roemer's Archiv für die Botanik, III, 1803, p. 64. Spyridia filamentosa is a very variable plant as is sufficiently clear from the many names the different forms have received in the course of time. To understand this we need only to consider the many different forms Kützing has figured in "Tabulæ phycologicæ", having put them down as separate forms (comp. De Toni, 1. c). It is, of course, always a difficult thing to decide, whether any of these forms really ought to be considered as a proper species or not. But to judge from the West Indian material the species seems to be a very plastic plant, highly influenced by the external conditions. In the West Indies I have found it in more sheltered places and in shallow water. It is common in lagoons and bays, but the mechanical influence of the waves may often he strong even in such places e. g. in certain places in the harbour of Charlotte Amalia. Light is another factor having much influence upon the shape of the plant. Of course this varies a good deal according to whether the plant is growing upon coral reef or atta- ched to the roots of mangroves, thus Fig. 222. Spyridia filamentosa growing in the shade of these trees. (^"1^/) "^J^- ^^'^ fj^^^""^' .â ,.-,,. , men from
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