. Botanisk tidsskrift. Plants; Plants -- Denmark. — 163 - on Ptilota and Laminaria digitata down to a depth of 10 fathoms. It has been gathered with unilocular sporangia in May—June and with pkuilocular sporangia in June. In his List of the marine Algae of Berwick-on-Tvveed ^) p. 58 Batters mentions the plurilocular sporangia of this species, saying: ,In the present genus the plurilocular sporangia are formed in the continuity of the branches", but he gives no further particulars. Reinke supposes () that Fosliea curta (Pylaiella curia Fosl.) is identic with Isthmoplea sphrerophora wit
. Botanisk tidsskrift. Plants; Plants -- Denmark. — 163 - on Ptilota and Laminaria digitata down to a depth of 10 fathoms. It has been gathered with unilocular sporangia in May—June and with pkuilocular sporangia in June. In his List of the marine Algae of Berwick-on-Tvveed ^) p. 58 Batters mentions the plurilocular sporangia of this species, saying: ,In the present genus the plurilocular sporangia are formed in the continuity of the branches", but he gives no further particulars. Reinke supposes () that Fosliea curta (Pylaiella curia Fosl.) is identic with Isthmoplea sphrerophora with plurilocular sporangia, and points out the great reseni- blence of these two species. I have in SW. Iceland and S. Iceland met with specimens having plurilocular sporangia. These plants are fully agreeing with Fosliea curta (Fosl.) Rke. according to Foslie's description, figures (1. c.) and original specimens here at the Botanical Museum. I have no doubt at all that the specimens in question belong to Isthmoplea spluierophora, as they precisely a agree with the plants bearing unilocular sporangia in every- thing except that they have |)lurilocular sporangia. The size of the plants is the same, the thickness of the filaments is nearly the same, the ramifica- tion, the structure of the frond and the shape of chromato- pho!-es are the same. Gonse- ((uently Fosliea curia must be regarded as identical with Isth- moplea spha^rophora. Reinke (1. c.) however points out some differences between Fosliea carta and Isth- moplea sphasrophora. tlie main axis of the former being narrower below, of the latter thicker below, and further he mentions that the branches of F. curta are ending in a hairlike point (Haarspitze), wanting in I. sphaerosphora. 1 do not find any such difference. The axis of the polysiphonous specimens, whether they bear unilocular or plurilocular sporangia, is usually narrowei- below. The axis of plants with unilocular sporangia measured below 30^/. and about the mi
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