— 150 — 



N. I c e 1. Hiisey. 



NW. I c el. isafjöröur; Dyrafjöröur (CO.). 



SW. I cel. Hvammsfjöröur, Stykkishölmur, Reykjavik. 



Farn. Dumontiaceæ. 



Dumontia filiformis (Fl. dan.) Grev., Strömf. Algveg. p. 30. 



It grows in rock-pools in the litoral region both on sheltered and 

 exposed coast. Collected with tetraspores in May— June, with antheridia 

 in May and with cystocarps in June. 12 — 24 cm. high, and the branches 

 1 — 2 mm. broad. 



E. lcel. Hölmar in Reyöarfjöröur. 



SW. I c el. rather common. Stykkishölmur, Ölafsvfk, Reykjavik ; Njarö- 

 vik (CO.). 



S. I c el. Eyrarbakki, Vestmannaeyjar. 



Dilsea edulis Stackh., Sarcophyllis edulis Kjellman, The Algæ of the 

 Arctic Sea p. 152. 



It is only known from one place, where it was growing in the Fucus- 

 zone in the litoral region. 2 — 5,5 cm. high and 1 — 2,5 cm. broad. 



SW. I c e 1. Öndveröarnes. 



Fam. Nemastomaceæ. 



Furcellaria fastigiata (Huds.) Lam. 



One specimen of this plant is in the herbarium of the Botanical Museum 

 in Copenhagen. On the label is written in Schousboe's handwriting: Ex Islandia. 



As neither the collector nor the finding-place is known, this species must 

 be mentioned as a doubtful Icelandic plant. 



Fam. Squamariaceæ. 



Petrocelis Ilennedyi (Harv.), Batters, A list of the marine Algæ of 

 Berwick-on-Tweed. 



It forms rather great crusts on the stems of Laminaria hyperborea. 

 Collected with tetraspores in January and July— October. In this species 

 Codiolum Petrocelidis Kuckuck is a frequent endophyte. 



NW. Icel. Isafjöröur (CO.). 



S W.I c el. Melar, Skögarnes, Reykjavik, Seltjarnarnes. 

 S. Icel. Eyrarbakki. 



Cruoria arctica Schmitz in Rosenv., Grl. Havalg. p. 784. 



It grows in the sublitoral region to a depth of c. 10 fathoms, and 

 at low-water-mark in the Gorallina-zone. Collected with tetraspores in 

 June— July. 



SW. Icel. Stykkishölmur, Brimnes ; Keflavik by Snæfellsjokull (CO.). 



