KONGL. SV. VET. AKADEMIENS HANDLINGAE. BAND. 20. N:0 5. 257 



Description. This species forms thin, uneven, blackish-brown when dried, elongated, 

 almost linear, more or less confluent crusts on old submersed wood (fig. 8). The basal 

 layer of these crusts is composed of firmly united, branching rows of cells, pretty di- 

 stinctly parallel to one another, never flabellate as in L. fatiscens. These cells have 

 thick walls; in optical longitudinal section they are square, rectangular, elliptic or irre- 

 gularly 4 — 6-angular (fig. 9). The thickening layer is formed of vertical cell-rows 

 issuing from the basal layer, terete-sixangular in periphery, simple or scarcely branching, 

 which are rather loosely united upwards so as to become separated from one other 

 by stronger pression. They are at least 250 A*- in length and in full-grown individuals 

 are composed of at least 20 cells which are square or rectangular in optical longitudinal 

 section, and more high than thick. Their length is 10 — 15 (*., thickness 8 — 10 f^. (fig. 

 10 — 11). In L. fatiscens these cells are less high than thick. Reproductive organs of 

 the species are not known at present. By the shape of the crust, the direction of the 

 horizontal cell-rows, and the shape of their cells the present species is distinguished 

 from the known L. fatiscens. 



Habitat. It has been found literal, growing in sheltered localities on old wood in 

 company with Chcetophora pellicula and Callothrix Harveyi. 



Locality: The Norwegian Polar Sea: Collected at Talvik in the interior of Al ten- 

 fjord in Finmarken in the middle of September. 



Fam. SCYTOSIPHONEiE Thur. 



ill Le Jol. Liste Alg. Cherb. p. 14 et 20. 



Gen. Ilea (Fr.) Aresch. 



Phyc. Scaiid. p. 353; Fr. F1. Scan. p. 319; ex parte. 



Ilea fascia (Mull.) Fe. 



1. c. p. 321. Fucus fascia Mull. F1. Dan. t. 768. 



f. typica. 

 Descr. Laminaria fascia J. G. Ag. Spec. Alg. 1, p. 129. 

 Fig. Fucus fascia Mull. 1. o. 

 Exsicc. Ilea fascia Aresch. Alg. Scand. exsicc. N:o 96; spec, thallo angusto. 



f. ccBspitosa (J. G. Ag.) Farl. 



New Engl. Alg. p. 62. Laminaria csespitosa J. G. Ag. Nov. p. 14. 

 Descr. Laminaria csespitosa J. G. Ag, Spec. Alg. 1, p. 130. 

 Fig. Phyllitis csespitosa Born, et Thur. Etud. Phycol. t. 4. 

 Exsicc. Ilea fascia Aresch. Alg. Scand. exsicc. N:o 96; spec, thallo latiore. 

 Syn. Ilea fascia Kleen, Nordl. Alg. p. 39. 



Laminaria fascia J. G. Ag. Gronl. Alg. p. 110. 

 » » AsHM. Alg. Hayes, p. 96. 



» » Dickie, Alg. Oumberl. p. 237; Alg. Sutherl. 1, p. 140; 2, p. 191. 



Phyllitis fascia Gobi, Algenfl. Weiss. Meer. p. 69. 



K. Vet. Akad. Handl. Band. 20. N:o 6. ^'J 



