30 M. FOSLIE. [1905 



siderable resemblance to small forms of L. fornicatum. On the 

 other hand, particularly the form of f. subfastigiata which is atta- 

 ched to rocks now and then approaches certain branching forms 

 of Phym. polymorphum in habit. Cp. under the latter species 

 Sometimes the form develops coarse branches and then approaches 

 coarse forms of L. topkiforme f. sphcerica, and as the inner 

 branches of the latter form are sometimes fairly coalescing, the 

 resemblance will be considerable, though the branches of L. gla- 

 ciate are mostly more irregular with more wartlike processes. De- 

 finite charachters, however, by which such specimens can be di- 

 stinguished, are scarcely statable. The same is the case of young 

 specimens attached of L. toplnforme and L. Granii. 



As to reproductive organs, the conceptacles of sporangia partly 

 appear in the crust, partly and most frequently in the upper part 

 of the branches. They are now but very little prominent, now 

 subprominent. In the latter case the roof sometimes falls into 

 decaj', and the conceptacles are not gradually overgrown, but the 

 scars are effaced by new-formed tissue. This I have seen even in 

 specimens typical and vigorously developed. They are frequently 

 rather crowded, 300 (250)— 400 or up to 500 //. in diameter and 

 intersected with 50 — 70 muciferous canals. The sporangia are 

 two-parted, 80— 180 ft long and 40— 80 /* broad. The cystocarpic 

 conceptacles are conical and of about the same size as those of 

 sporangia. A few smaller ones seen among the latter about 200 //- 

 in diameter, are likely to be those of antheridia. 



This species occurs in the sublitoral region at the depth of 

 3 — 20 or 30, particularly 8 — 20 fathoms. A specimen is said to 

 have been dredged up in a depth of 80 fathoms near Grimsey, 

 Iceland. Cp. Jonsson, Alg. Icel. I, p. 153. The alga thrives 

 best on the open coast, but is also found in larger fjords. It 

 appears now sporadically, now gregariously in great numbers. 

 Cp. Kjellman 1. c. Specimens with reproductive organs have 

 been taken from the month of March to the month of December. 



As to the geographical distribution of this species I want to 

 remark that I got a specimen from Professor Far low (herb. no. 

 XXII), labelled Bermuda, leg. I. C. Hill. This specimen represents 



