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Desniarestia ligulata (Lightf.) Lam. 



I hiive seen in the lieihaiiiun of the Botanical museum at Copenhagen 

 one specimen belonging to this species, on the label of which is written: „Fucus 

 ex Islandia". As neither the collector nor the finihng place is known it must 

 1)6 regarded as a doubtful Icelandic })lant. but as it occurs in the Faeroes it 

 may also possibly be found in S. Iceland. 



Fani. Chordariaceee. 



Castngnea virescens (Garni.) Tlmr., ilosenv. Deux. Mem. p. 58 ; Eudcsme 

 virescens Strcimf. Algveg. p. 47. 



This species occurs in rock-pools in the litoral region, and in tlie 

 upper subliloral region down to a depth of 5 fathoms. It had unilocular 

 sporangia in June — September and plurilocular sporangia in August. The 

 frond attains a length of 30 cm. 



E. I eel. Fossarvi'k in BerufjorQur. 



N. I eel. Arnarnes in EyjafjorOur. 



NW. I eel. Kolbeinsa, Broddanes. 



SW. I eel. Stykkisholmur, Olafsvik, Einarslon. 



Leathesia difTorniis (L.) Areseh., Kjellm. Arct. Alg. p. 252. 



Grows in rock-pools in the litoral region near low-water mark. It is 

 only known from two places, in the one of which, Reykjavik, it occurred 

 gregariously on Ahnfeltia plicata, Corallina and rocks. It had plurilocular 

 sporangia in June and August (in Reykjavik). Specimens from NW. Icel. 

 gathered in September were sterile. 



NW. Icel. Kolbeinsa. 



SW. Icel. Reykjavik (G. 0., B. Saemundsson!). 



Chordaria flagelliforinis (Mull.) Ag., Strcimf. Algveg. p. 47 ; Rosenv. 

 Grl. Havalg. p. 854. 



All the Icelandic specimens belong to the typical form. They are up 

 to 55 cm. long and occur in the litoral region attached to rocks or other 

 algae ; the species is also found in the upper sublitoral region down to a 

 depth of 5 fathoms. Fructiferous specimens are met with in June-October. 



Common everywhere on the coasts. 



Fam. Chordacese. 



Chorda tomentosa Lyngb., Hydiophylologia Dan. p. 74; Rosenv. Grl. 

 Havalg. p. 854. 



This species occurs in the lower part of the litoral region and in 

 the sublitoral region down to a depth of more than 10 fathoms. The 



