. Dansk botanisk arkiv. Plants; Plants -- Denmark. 230 Dansk Botanisk Arkiv, Bd. 3. Nr. Fig. 218. Antithamnion spec Part of an erect filament. (About 140 :1). are cylindrical 2—3 times as long as broad. In the basal part of the branchlets the cells are about 16;/ broad, tapering gradu- ally upwards; the uppermost ones in the end of the filaments are often short, conical. The chro- matophores consist of irregularly shaped discs or short plates. At the summit of the young branchlets long, thin hairs are generally present (Fig. 218); these hairs are about 3 fj. thick and about 80 (J. long. Gl
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 230 Dansk Botanisk Arkiv, Bd. 3. Nr. Fig. 218. Antithamnion spec Part of an erect filament. (About 140 :1). are cylindrical 2—3 times as long as broad. In the basal part of the branchlets the cells are about 16;/ broad, tapering gradu- ally upwards; the uppermost ones in the end of the filaments are often short, conical. The chro- matophores consist of irregularly shaped discs or short plates. At the summit of the young branchlets long, thin hairs are generally present (Fig. 218); these hairs are about 3 fj. thick and about 80 (J. long. Gland-cells did not occur in this plant. As mentioned above the plant was quite sterile, neither tetra- sporangia, nor other reproductive organs were found. This plant seems to come near to A. cruciaium, but the few specimens I have seen were desti- tute of gland-cells, had always opposite, not verticillate branchlets, these being alternately, not oppositely branched. The plant was found epiphytic upon an old specimen of Sargassum vulgare washed ashore. St. Croix: Near the estate Lt. Princess in the neighbourliood of Cliristiansted. Crouania J. Ag. 1. Crouania attenuata (Bonnem.) J. Ag. Agardh, J., Algae mediter., 1842, p. 83; Spec. Alg. vol. II, p. 105; Epi- crisis, p. 84. Harvey, W. H., Nereis , p. 226, pi. 31 D; Pliycol. Brit., pi. 106. Crouan in Ann. Sc. Nat., Bot., Sér. III, 1848, p. 375, tab. 12, figs. 24—25. Crouania bispora Crouan in Ann. Sc. Nat., Bot., Sér. III. p. 374, tab. 12, figs. 21—23. Mesogloia attenuata Ag., Systema, p. 51. (For more synonyms comp, also De Toni, Sylloge Alg., vol. IV, Flori- deæ, p. 1417). This species occurs in shallow water both in exposed and sheltered places, and in deep water; as the specimens vary rather much according to the different growing places I shall first give a short description of a plant from an exposed locality and after- wards compare it with a specimen from deep Please note that these images are extr
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