22 



CARL SKOTTSBERG, MARINE ALGjE 1. PH^OPHYCE^. 



During my visit to the Biological Station on Heligoland I had much discussion 

 with Prof. Kuckuck on this species and the following. All the specimens from the 

 Falklands have two kinds of assi milators, shorter of definite growth, with prolonged 



basal cells, and longer ones, where cell 

 divisions take place above the base. There 

 is, however, no such sharp difference be- 

 tween long and short filaments as between 

 the latter and the paraphyses in E. fucicola. 

 My plants are all provided with hairs, 

 which do not occur in »typical» Elachis- 

 tas according to Kuckuck. Further, the 

 basal parts of E. rosarioides are more or 

 less endophytic. We came to the conclusion 

 that it might be compared with E. stellu- 

 lata Griff. Batters bronght all the en- 

 dophytic species to Myriactis Kutz. Kuck- 

 uck did not believe in this distinction 

 but was inclined to bring the hair-bearing 

 species with short assimilators to the 

 latter genus. The type is M. pulvinata 

 Kutz., which has a large central nucleus 

 of hyaline cells, from which the assimila- 

 tors radiate ; habitually, it differs from the 

 species låter added to Myriactis. Even if 

 this genus is retained in its modified sense 

 I cannot very well unite E. rosarioides 

 with it, though it must be admitted that 

 the plants from Los Amigos are very like 

 such a species as M. monilijormis (Fosl.) 

 Kylin Algenfl. norw. Westk., p. 13, f ig. 3, 

 for they have only shorter assimilators 

 (Fig. 10 c). A comparison with the illu- 

 strations of the Falkland plants shows 

 that there is much in favour of my belief 

 that all belong to the same species. Also 

 among the specimens from St. 8 I have 

 observed some where the long filaments 

 are few or almost none. Fig. 9 b shows a 

 fragment of a plant with both sporangia 

 and gametangia. The drawing was made 

 on Heligoland; I have never been ableto 

 discover a second instance of this kind, 

 nor to find the original, from which the figure was drawn, but according to my 

 notes there was no room for a mistake. 



Fig. !). a — b Elachista rosarioides from St. 8; a~with spo- 

 rangia and two kinds of filaments, X 200; b base of plant 

 with sporangia and gametangia, X 200. C — d E. pusilla, 

 C small plant from St. 4, X 100; d part of plant with game- 

 tangia, X 200. 



