. Botanisk tidsskrift. Botany; Plants; Plants. — 365 - NW. I cel. common. SW. Icel. Reykjavik (CO.) probably common. S. Icel. Eyrarbakki, Vestmannaeyjar. Rhizoclonium riparium (Roth) Harv., Rosenv. Grl. Ha valg. p. 913, Deux. Mém. p. 103. f. polyrhiza Rosenv. Grl. Havalg. p. 913. The Icelandic specimens are 29 —36(—43)// thick; the cells are as long as broad or twice as long as broad and the membrane is 1,5—3 (—4)// thick. In other respects my plants fully agree with the description given by Rosenvinge (Grl. Havalg. 1. c). It grows gregariously in rock- clefts at or above high-water mark. f. v
. Botanisk tidsskrift. Botany; Plants; Plants. — 365 - NW. I cel. common. SW. Icel. Reykjavik (CO.) probably common. S. Icel. Eyrarbakki, Vestmannaeyjar. Rhizoclonium riparium (Roth) Harv., Rosenv. Grl. Ha valg. p. 913, Deux. Mém. p. 103. f. polyrhiza Rosenv. Grl. Havalg. p. 913. The Icelandic specimens are 29 —36(—43)// thick; the cells are as long as broad or twice as long as broad and the membrane is 1,5—3 (—4)// thick. In other respects my plants fully agree with the description given by Rosenvinge (Grl. Havalg. 1. c). It grows gregariously in rock- clefts at or above high-water mark. f. valida Fosl., Rosenv. Grl. Havalg. p. 915. My plants are 29 — 48// thick; the cells are as long as broad or twice as long as broad and the membrane is (2—)3 —4( —5)// thick. It occurs gregariously in rock-clefts at or above high-water mark. Lateral branches, as in f. polyrhiza, do not rarely occur. Judging from my material of these two forms, there is no distinct limit to be drawn between them. The specimens growing in the rock-clefts have numerous rhizoids, as f. polyrhiza, while plants I met with in tide pools at high-water mark had only very few rhizoids. f. implexa (Dillw.) Rosenv. Grl. Havalg. p. 915. The Icelandic plants are 17—29// thick; the cells are as long as broad or much longer, up to 10 times longer than broad, and the membrane is 1,5 — 3// thick. In other respects my plants agree fully with Rosenvinge's description. As mentioned above the cells sometimes attain a con- siderable length, but as both short and long cells occur in the same filament, I think it unnecessary to give a more detailed description of such speci- mens or to give them a name. Fructiferous specimens have been gathered in July—August. The greatest part of the sporangia was emptied and only some few of them contained 9 zoospores. The spores escape through an opening in the middle or nearer one of the ends of the sporangium (cfr. fig. 12). I have also in f. valida occasion
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Keywords: ., bookcentury1800, bookdecade, booksubjectbotany, booksubjectplants
