. Botanisk tidsskrift. Plants; Plants -- Denmark. — 343 — longer than broad or their length is varying to V/2 of the breadth. The filaments are not seldom somewhat irregnlarly formed and short proliferations are not unfreqnent. SW. I eel. Arnarbffili, Hriitey near Bjarnarhofn. Enteromorplia aureola (Ag.) Ktitz. Tab. phyc. Vol. VI, Tab. 40, 111; IJlva aureola Ag. Ic. alg. europ. tab. 29; Capsosiphon aureolus Gobi; Ilea fulvescens J. Ag. Ulva- ceae p. 114; ?Solenia fulvescens Ag. sp. p. 420. Enteromorpha quaternaria Ahlner in Wittr, et Nordstedt Alg. exsicc. Nr. 138 and 139. I have only met with
. Botanisk tidsskrift. Plants; Plants -- Denmark. — 343 — longer than broad or their length is varying to V/2 of the breadth. The filaments are not seldom somewhat irregnlarly formed and short proliferations are not unfreqnent. SW. I eel. Arnarbffili, Hriitey near Bjarnarhofn. Enteromorplia aureola (Ag.) Ktitz. Tab. phyc. Vol. VI, Tab. 40, 111; IJlva aureola Ag. Ic. alg. europ. tab. 29; Capsosiphon aureolus Gobi; Ilea fulvescens J. Ag. Ulva- ceae p. 114; ?Solenia fulvescens Ag. sp. p. 420. Enteromorpha quaternaria Ahlner in Wittr, et Nordstedt Alg. exsicc. Nr. 138 and 139. I have only met with this species in one place where it occurred in the litoral. Fig-. 4. Percursaria percursa (Ag.) K. a A fragment of a ramified specimen ending to the right in a rhizoid. h A fragment of a specimen showing the two cell-rows sepa- rated and to tlie left ending in a rhizoid. (85 : 1.) region. Most of my specimens are fully unbranched, but somewhat branched specimens occasionally occur. The frond is 13—14 fj. thick and the height of the cells (in transverse section of the frond) is about equal to the breadth. Fructiferous specimens have been gathered in August. NW. Icel. Broddanes. Enteromorpha Lima (L.) J. Ag., Ulva enteromorpha a, lanceolata Le Jol. Liste p. 42. The species occurs in the litoral region, especially in pools. The Icelandic plants are 3 —40cm. long, 0,5—3cm. broad and 30 —40/^ thick. Fructiferous specimens have been gathered in Sept. —Octob. The specimens gathered by Ostenfeld at Reykjavik in August belong to the f. undulata Le Jol. (1. c), but the specimens, which I collected at Reykjavik in October, usually bad a plain margin and the specimens from HafnarfjcirOur (also collected in October), had an undulate margin below and a plain margin above. Some of the specimens from Eyrarbakki (colkct^d in May) resemble somewhat the f. angusla Le Jol. (1. c). SW. Icel. Reykjavik (G. 0.); HafnarfjorOur. S. Icel. Eyrarbakki. Enteromorpha intestinalis (L.
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