. Botanisk tidsskrift. Botany; Plants; Plants. - 354 — Prasiola furfuracea (Mert.) Menegh., Imhäuser Prasiola p. 266; Fosl. Gontrib. I, p. 127; Börgesen Fær. Alg. p. 486. The Icelandic specimens occur on rocks at high-water mark often in company with P. stipitata, they agree fully with the description given by Imhäuser (1. c.) and also with the Færoese specimens (Börgesen 1. c). E. I cel. Vattarnes; Hölmar. N. I c el. Grimsey (O. D.). SW. Icel. Reykjavik. Prasiola stipitata Suhr, Imhäuser Prasiola p. 272; Kjellm. Arct. Alg. p. 303. The species occurs on rocks and stones at high-water mark. It
. Botanisk tidsskrift. Botany; Plants; Plants. - 354 — Prasiola furfuracea (Mert.) Menegh., Imhäuser Prasiola p. 266; Fosl. Gontrib. I, p. 127; Börgesen Fær. Alg. p. 486. The Icelandic specimens occur on rocks at high-water mark often in company with P. stipitata, they agree fully with the description given by Imhäuser (1. c.) and also with the Færoese specimens (Börgesen 1. c). E. I cel. Vattarnes; Hölmar. N. I c el. Grimsey (O. D.). SW. Icel. Reykjavik. Prasiola stipitata Suhr, Imhäuser Prasiola p. 272; Kjellm. Arct. Alg. p. 303. The species occurs on rocks and stones at high-water mark. It is much more common and gregarious than the last named species and it often covers the rocks with a green growth. Probably common. E. Icel. Vattarnes, Brimnes, Borgarnes. N. Icel. Grimsey (0. D.); Eyjafjöröur. NW. Icel. Skâlholtsvfk. SW. Icel. Reykjavik. S. Icel. Vestmannaeyjar. Fam. Ulotliricaceæ. Ulothrix consociata Wille Studien p. 25. var. islandica no v. var. I have in several places met with a Ulothrix, which in company with other algæ e. g. Ulothrix flacca, Godiolum and Urospora mirabilis forms a matted growth on rocks at or above high-water mark. My specimens are all in dry condition and their colour is light green or light yellow- green. The filaments are not rarely adherent to one another especially in the lower part, and at the base usually few or many filaments coalesce. The thickness of the fila- ments varies from 10 {u to 29 fi, but they are usually 14 —22 ^ thick. The length of the cells I have found varying from about Vs to 2k of the breadth, and I have only occasionally seen cells, which were as long as broad. The cell-walls are usually very thick, especially the outer walls,. Fig. 5. Ulothrix consociata Wille var. islandica nov. var. a, b, c (311 : 1) show the base of the fila- ments with the rhizoids (compare the text); cl (215: 1) shows three filaments, which coalesce at the Please note that these images are extracted from scanned pag
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