24 CARL SKOTTSBERG, MARINE ALG^ 1. PHJEOPHYCEiE. 



This species has only one kind of assi milators; it is strictly epiphytic and is 

 provided with hairs. Kuckuck found that it was intermediate between Elachista 

 and Myriactis. It is of course quite impossible to prove that the plant from St. 47 

 is the same species, but I do not think it wise to describe it under another name 

 only because it bears sporangia instead of gametangia, for otherwise it is too like 

 the specimens from St. 4. 



E. pusilla seems to be related to E. Chordce (Aresch.) Kylin, Stud. Algenfl. 

 schwed. Westk. p. 62, fig. 15 and to Myriactis moniliformis, but differs in the shape 

 of the assimilators, etc. There is also an unmistakable likeness between my species 

 and E. stellaris Aresch. as figured by Kylin in Zur Kenntn. Algenfl. schwed. 

 Westk., p. 7, fig. 1. But in this sporangia and gametangia also occur on the long 

 filaments, and Kuckuck told me that he regarded E. stellaris as identical with 

 Sympfwricoccus radians Rke, making the new combination S. stellaris (Aresch.) Kuck. 



Finally it should be mentioned that M. Nieuwland during his energetic efforts 

 to revise the generic names in the entire vegetable kingdom, has found that Myriactis 

 cannot stånd for a genus of algse as the name is preoccupied for another genus. 

 It is renamed Gonodia Nieuwl. Amer. Midi. Journ. (Syn. Myriactis Kutz. 1843 non 

 Less. 1831 (Compositse)). 



Chordariacese. 

 Castagnea Derb. et Sol. 



C. Zosterre (Mohr) Thur. — Fig. 11 a— b. 



Patagonia: Skyring Water, Puerto Altamirano, in brackish water, 5 — 10 m, 

 growing on Ruppia filifolia (St. 19, 23. 4. 08, sp.). — I take this to be the same 

 species called C. Zosterce by Börgesen, Mar. Alg. Dan. West Ind. Pt. 2, p. 184. And 

 I find that it is quite like the species called C. Zosterce or Eudesme Zosterce by 

 Swedish algologists. Both Börgesen and Kylin quote Farlow's illustration in Mar. 

 alg. New Engl., but according to Collins and Hervey in Alg. of Bermuda, p. 75, 

 the Bermuda plant which they believe to be the same as Börgesen's C. Zosterce, 

 »is certainly not O. Zosterce Farlow, but resembles C. virescens Farlow». However, 

 Börgesen's or Kylin's Zosterce cannot be confounded with what we call Eudesme 

 virescens here in Scandinavia. The confusion in this group will continue till somebody 

 finds the necessary time for a general revision. 



My plant attains a length of 13 cm and a thickness of 1—2 mm; it is simple 

 or sparingly branched, gelatinous, rather firm, solid or finally hollow. In structure 

 and mode of growth it seems to agree with Börgesen's plant. The assimilators are 

 150 — 200 jj. long, their segments 10 — 12 jx thick, the hairs 11— 12 [x. The sporangia 

 measure 50 — 75x30 — 45 ;x. In some instances I found the outer cells of the assi- 

 milators divided by a longitudinal wall, suggesting the first stage towards the forma- 

 tion of gametangia, which have been found together with the sporangia by Börgesen 

 and Kylin. 





