gO M. Foslte. 



largest near tbe middle layer. Cp. Kj ellm. 1. c. t. 25, fig. 

 10. The muciferous lacunse seem in general to be more 

 numerous by L. Gunneri and often also larger, especially in 

 tbe lamina, tban by L. nigripes. 



Tbe sorus is never developed to tbe base of tbe lamina 

 such as by L. nigripes. Cp. Kjellm. 1. c. p. 297. A moon- 

 shaped, 5 — 8 cm. bigb part of tbe base is always barren. 

 From bere it forms a broad girdle, 10 — 30 cm. upwards, com- 

 monly 15 — 25 cm., and sometimes extending to tbe top of 

 tbe segments. 



L. Gunneri appears to live in tbe upper part of tbe 

 sublitoral region, though probably farther down than L. ni- 

 gripes, because tbe former has been found only after heavy 

 winter-gales, but the latter also washed ashore in tbe summer. 

 The plant is fastened to stones, or more often to dying stems 

 of Maria and Laminaria Jiyperborea. Most of tbe specimens 

 I got are said to have been collected in February and March, 

 and these bear zoospores. A few that have been taken in 

 November are sterile. 



Distribution: Only found at Berlevaag, probably rather 

 scarce. 



Laminaria byperborea (Gunn.) Fosl. 



Lam. Norw. p. 42; Fucus hyperboreus Gunn. Fl. Norv. 1, p. 34. 



f. typica Fosl. 

 Bidr. p. 15. 

 Descr. Laminaria Cloustoni Le Jol. Exam. p. 56. 



Hafgygia „ Aresch. Obs. Pbyc. 4, p. 1. 



Laminaria hyperborea Fosl. Lam. Norw. p. 42. 

 Fig. „ „ „ „ t. 1, flg. 1-8. 



„ digitata Harv. Phyc. Brit. t. 223, fig. 1. 



f. compressa Fosl. 



Lam. Norw. p. 42. 

 Descr. Laminaria digitata f. longifolia Fosl. Bidr. p. 19. 



„ hyperborea f. compressa FosL Lam. Norw. p. 42. 



Fig. „ „ „ „ „ t. 1, fig. 9. 



