— 343 — 



longer than broad or their length is varying 

 to Ht of the breadth. The filaments are not 

 seldom somewhat irregularly formed and 

 short proliferations are not unfrequent. 



SW. I c el. Arnarbæli, Hrûtey near 

 Bjarnarhöfn. 



Enteromorpha aureola (Ag.) Kütz. Tab. 

 phyc. Vol. VI, Tab. 40, III ; Ulva aureola 

 Ag. Ic. alg. europ. tab. 29 ; Gapsosiphon 

 aureolus Gobi; Ilea fulvescens J. Ag. Ulva- 

 ceæ 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 

 region. Most of my specimens are fully 

 unbranched, but somewhat branched specimens occasionally occur. The 

 frond is 13 — 14 fi 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. I c el. Broddanes. 



Enteromorpha Linza (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 had a plain margin and the specimens from 

 Hafnarfjöröur (also collected in October), had an undulate margin below 

 and a plain margin above. Some of the specimens from Eyrarbakki 

 (collected in May) resemble somewhat the f. angusta Le Jol. (1. c). 



SW. I cel. Reykjavik (CO.); Hafnarfjöröur. 

 S. I cel. Eyrarbakki. 



Enteromorpha intestinalis (L.) Link., emend. Rosenv. Grl. Havalg. 

 p. 957; Börgesen Fær. Alg. p. 487. 



This species, which is exceedingly multiform, is common everywhere 

 along the coasts of Iceland, and occurs both in exposed and in sheltered 



Fig. 4. Percursaria percursa 



(Ag.) K. Rosenv. 

 a A fragment of a ramified 

 specimen ending to the right 



in a rhizoid. 

 b A fragment of a specimen 

 showing the two cell-rows sepa- 

 rated and to the left ending in 

 a rhizoid. (85 : 1.) 



