M. Foslie. Contribution II. 



45 





by a canal. The sporocarpia are very variable, partly and 

 probably most of ten pearsliaped, but not seldom ovate or 

 even subspberical, 45 — 120 \i long and 20 — 60 \i thick. I 

 have not seen certain conceptacles of sporangia. They final- 

 ly grow down into the frond. Overgrown conceptacles are 

 to be found in the crust as well as in the processes, but 



* 



they are always few in number. 



The present plant seems to be a deep-water form, al- 

 though it is hitherto known from a single locaiity only. I 

 found it at Skorpen in Kvænangen (Trom so amt) on a depth 

 of 10 -15 fathoms, local but plentiful, bearing ripe carpo- 

 spores in the beginning of September. 



Lithothamnion circumscriptum Stromf . 



Alveg. Isl. p. 20, t. I, fig. 4-8. 



In Contribution I, p. 9, I have mentioned «tetraspore- 

 bearing» specimens of this species from East-Finmarken in- 

 stead of conceptacle-bearing ones. When collected at the 

 end of July the spores were recently escaped. 



In West-Finmarken as well as within Tromso amt I 

 also met with a Lithothamnion, growing on stones or musc- 

 les which coincides . well with the description of the species 

 m question. The specimens are sterile, but they bear scars 

 after the emptied conceptacles of sporangia, which do not 

 grow down into the frond, forming arather sbarply defined 

 zone. Cp. pl. 3, fig. 8. I have collected specimens at Havo- 

 , sund and Skarsvaag in West-Finmarken, growing in pools 

 within the litoral zone, and in Tromso amt some few speci- 

 mens at Skorpen in Kvænangen in company with L. colli- 

 culosum on a depth of 10—15 fathoms, and at Mestervik in 

 Malangen on 5 — 10 fathoms water. 



Lithophyllum Lenorm an di (Aresch.) Rosan. 



Melob p. 85; Melobesia Lenormandi Aresch. in J, G. Ag Spee, 

 Atø. 2, p. 514. . " 



