130 M. FOSLIE. 11905 



former case it is sometimes like L. Lenormandi f. squamidosa in 

 habit. Otherwise the form seems to be little independent. It rises 

 from small extraneous bodies — sometimes other alga? — forming 

 an uneven substratum, or particularly from such bodies attaching 

 themselves to the original crust and being gradually overgrown, 

 the result of which are very uneven complexes of crusts of the 

 alga in question or layers irregularly alternating, and up to about 

 5 mm thick. Such specimens may be greatly diverging from 

 typically developed ones in habit. Besides they are frequently 

 provided with wartlike excrescences, which, however, seem to have 

 risen in the same way, and hardly ever are real branchings. This 

 form includes L. adplicitum Fosl. 



As to structure, the species in all essentials corresponds with 

 L. macrocarpum. The length of the basal cells is 3—5 times or 

 up to 8 times the breadth. They are 30 — 90 p., generally 40 — 70 p., 

 long and 8 — 20 p, mostly 12 — 15 p broad. The length of the 

 perithallic cells is twice to four times the breadth; they are 20-50/a 

 long and of about the same breadth as the hypothallic cells. 



Also as to the conceptacles of sporangia the species corre- 

 sponds with L. macrocarpum, particularly with f. intermedia and 

 f. fairbensis. The said organs are hemispheric-conical or subconical, 

 300 (250)— 500 p. or sometimes up to 600 p. in diameter. The 

 sporangia- are two-parted, 90—120 p long and 30—60 p- broad. 



The alga occurs in the lower part of the litoral region and 

 particularly in the sublitoral region. At Fredriksvsern on the southern 

 coast of Norway I have taken it in a depth of 7 — 10 fathoms. It 

 has been found with reproductive organs from March till October. 



Area: South coast of Norway: Fredriksvaern, f. typicaQ); 

 the Faeroes, f. typica (Ostenfeld, Borgesen!); Scotland: Ber- 

 wick, f. typica, f. conflnis (Batters!); South coast of England, 

 {.typica, f. con finis (Holmes, Batters!); Ireland: Frenchport, f. 

 typica (Johnson!), Fahy Bay (Hanna!), Roundstone (Hanna!,!); 

 Atlantic coast of France, f. typica, f. confilnis (Crouan, Thuret, 

 Bornet, Debt-ay, Sa.uvageau!); the Azores, f. typica (Bohlin!) 



