. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 259. cimens found here are small, seldom more than 5 cm. high (Fig. 251). Plants with tetrasporangia as well as with antheridia and cystocarps are found. The tetrasporangia (Fig. 252) are formed in the ramuli, mostly in their upper ends, often, however, in ^U of their length. The lowest sporangia are the oldest ones. Often, too, the summit of the branch from which the ramuli issue, is sporangiferous. The dia- meter of the tetrasporangia is about 110 ju. The antheridial stands are placed in th
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 259. cimens found here are small, seldom more than 5 cm. high (Fig. 251). Plants with tetrasporangia as well as with antheridia and cystocarps are found. The tetrasporangia (Fig. 252) are formed in the ramuli, mostly in their upper ends, often, however, in ^U of their length. The lowest sporangia are the oldest ones. Often, too, the summit of the branch from which the ramuli issue, is sporangiferous. The dia- meter of the tetrasporangia is about 110 ju. The antheridial stands are placed in the upper end of the ramuli (Fig. 252), later also upon the summit of the main filament itself. The cystocarps are placed scattered upon the ramuli and upon the upper end of the main axis (Fig. 251). The cystocarps are ovate â â spherical about 1 mm broad and 700/^ high. Some few larger specimens were dred- ged in a depth of about 30 meters; these specimens were upon the whole more slen- derly built, and the ramuli had only 1â3 cystocarps each. St. Croix: Behind Long Reef near Christiansted. St. Jan: Off Cruz Bay. Geogr. Distrib.: Warmer parts of the Atlantic coasts of Europe and America, Mediterranean Sea. Acanthophora Lamouioux. 1. Acanthophora spicifera (Vahl) Borgs. Børgesen, F., Some new or Uttle known West Indian Florideæ, II (Bot. 30. Bd. 1910, p. 201). Fucus spiciferus Vahl, Endeel kryptogamiske Planter fra St. Croix (Skrivter af Naturhistorie-Selskabet, 5. Bd., 2. Hefte, 1802). Esper, Icones Fucorum, 7. Heft, Nürnberg 1808. p. 108, tab. CLIX. Fucus acanthophorus Lamx., Dissertation sur quelques espéces de Fucus, Agen, An XIII (1805) p. 61, pi. XXX et XXXI, fig. 1. Acanthophora Thierii Lamx., Essai sur les genres de la famille des Thalassiophytes non articulées, Paris 1813, p. 44. Harvey, Nereis Boreali- Americana, Part II, p. 7, pi. XIV. J. Agardh, Spec. Alg., vol. II, part 3, Lund 1863, p. 819. Chondria acanthophora C. Ag., Spec. Alg., 18
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