— 167 — 



Sq'tosiphon lomentarius (Lyngh.) J. Ag., Rosenv. Grl. Havalg. p. 863. 

 Deux. Mem. p. 62; Algveg. p. 50. 



The species occurs in pools and rocks in llie litoral region, especially 

 in its lower part. The Icelandic plants are 6 — 30 cm. high and 0,7 — 5 mm. 

 broad ; they are sometimes constricted at intervalls. Specimens gathered 

 in May — October had plurilocular sporangia. Usually the fructiferous spe- 

 cimens of the typical form are furnished with |)araphyses. but 1 have met 

 with fructiferous specimens with hollow, cylindrical frond (o: belonging 

 to f. typica) without })araphyses; the Icelandic plants thus fully agree 

 with the Greenlandic specimens (cfr. Rosenv. Deux. Mem. 1. c). Some 

 few specimens I have, although with some doubt, referred to var. co»i- 

 jjlanata Rosenv. (1. c). 



The species is probably common at the Icelandic shores. 



E. I eel. BerufjorOur, Vattarnes, Holmanes, SeyOisfjorOur. 



N. Icel. Grjntnes (CO.); Hri'sey. 



NW. Icel. kolbeinsa ; Latravi'k in AOalvik (CO.), SkutulsfjorOur (CO.). 



S\V. Icel. Stykkisholmur, Olafsvi'k, Reykjavik. 



S. Icel. Vestmannaeyjar. 



Pliyllitis zosterifolia Rke. Algenflora der westl. Ostsee p. 61 ; Rosenv. 

 Grl. Havalg. j). 862. 



It grows in pools and rocks in the lower litoral region, most frequently 

 at low-water mark, and in tlie upper sublitoral region in a depth of 1 —4 

 fathoms. It has been gathered with plurilocular sporangia in May — June. 



The frond is 7 — 22 cm. long and 0,5 — 2,5 mm. broad. The trans- 

 verse section of the narrow forms is oval or oblong-oval, of the broader 

 forms nearly linear. Sometimes it is abundantly furnished with hair- 

 clusters, es])ecially the broader forms. As pointed out by Reinke (1. c.) 

 smaller or greater cavities are to be found liere and there in the frond, 

 especially in the broader forms. Some of the Icelandic specimens are broader 

 than the plants described by Reinke (1. c). The Baltic specimens he men- 

 tions, were only 0,6 mm. broad, but specimens from Cherbourg attained a 

 breadth of 1,5 m. The Greenlandic specimen (Rosenv. Grl. Havalg. 1. c.) 

 is 2 mm. broad and some of the Icelandic specimens are 2,5 mm. broad. 



From the narrow forms of Phyllitis fascia it is distinguishable, al- 

 though not easily, by its linear shape. It seems to be nearly related to 

 Scytosiphon lomentarius /9 complanatus, from which it is only distingished 

 by its narrower, firmer and solid or jiartly hollow frond. 



Probably common. 



E. Icel. Holmanes (CO.); Briinnes. Borgarnes. 

 NW. Icel. isafjorOur; DyrafjorOur (CO.); Bildudalur. 

 SW. Icel. Reykjavik. 

 S. Icel. Vestmannaevar. 



