. Botanisk tidsskrift. Botany; Plants; Plants. - 338 — I have met with this species growing in the outer walls of Chætop- teris plumosa, Sphacelaria radicans and Sphacelaria britannica. NW. Icel. Prestsbakki, Broddanes. SW. Icel. Reykjavik (G. 0.). Chlorochytrium Schmitzii Rosenv. Grl. Havalg. p. 964, Deux. Mém. p. 119. To this species I have referred some specimens occurring in an old crust of a Ralfsia collected by Ostenfeld at Reykjavik. The Icelandic specimens are 40—110 u long and M — lOfi broad, they are thus much shorter than the Greenlandic plants, which attain a length of 200 fjt (Ros
. Botanisk tidsskrift. Botany; Plants; Plants. - 338 — I have met with this species growing in the outer walls of Chætop- teris plumosa, Sphacelaria radicans and Sphacelaria britannica. NW. Icel. Prestsbakki, Broddanes. SW. Icel. Reykjavik (G. 0.). Chlorochytrium Schmitzii Rosenv. Grl. Havalg. p. 964, Deux. Mém. p. 119. To this species I have referred some specimens occurring in an old crust of a Ralfsia collected by Ostenfeld at Reykjavik. The Icelandic specimens are 40—110 u long and M — lOfi broad, they are thus much shorter than the Greenlandic plants, which attain a length of 200 fjt (Rosenv. 1. c). The shape of the Icelandic plants is, as in the Green- landic specimens, clavate or obovate, and the chromatophore is irregularly perforated with very small holes, but in this respect they agree also with the Greenlandic plants. I have seen in Rosenvinge's original preparations that the chromatophore of the Green- landic plants is perforated in a resemb- ling manner. The colour of the cell- walls of the Icelandic plants does not change to blue at application of chlor-zinc-iodide. SW. Icel. Reykjavik (G. 0.). Codioluin Petrocelidis Kuck. Bemerk, p. 259, fig. 27. The Icelandic specimens are 70 — 116 /i long (without the stalk) and 30 — 65/7. broad. The upper end of the cells is sometimes furnished with a papilla (cfr. Kuck., 1. c. fig. 27 L) and the stalk is either lateral or terminal. Both the stalk and the membrane of the head do not turn blue by chlor-zinc-iodide, whereas they turn red by ruthenium oxychloratum ammonia, consequently they do not consist of a cellulose but of pectose. The species occurs in the frond of Petrocelis Hennedyi and is met with both in the lower litoral region and in the upper sublitoral region on the stems of Laminaria hyperborea. SW. Icel. Skögarnes, Reykjavik. Codiolum gregarium AI. Braun, Alg. unicell. p. 19; Börgesen Fær. Alg. p. 517. I have only found this species in one place in E. Iceland, where it. Fig. 1. Chlorochyt
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