14 



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



separate Myriönema, taken in its present sense, from that order; there are species 

 such as M. subglobosum Kylin Algenfl. Schwed. Westk. p. 37, fig. 8, M . globosum (Rke) 

 Fosl. (comp. Börgesen, Mar. Alg. Faeroes p. 420, fig. 76), M. speciosum Borg. 1. 

 c. p. 421, fig. 78, M. fazroense Borg. 1. c. p. 424, fig. 79, where the erect filaments 

 are long, branched and bear numerous gametangia, so that they do not show much 



Fig. (». a — C Hecatonema maculans: a part of disc X ISO; b— C plants witli gametangia and liairs, X 360. d — Il Myrioncma 

 incommodum, d — f with sporangia, g — Il with gametangia, all X 300; d from St. 17 b, the others from S. 42. 



likeness to the short assimilators of a M. vulgäre Thltr., etc. To judge from the com- 

 parative studies of Satjvageau, it does not seem possible to separate such species as 

 those mentioned above from Myriönema. The difficulty of finding the best system - 

 atic position for some of these plants is shown by the fact that Cotton (Clare Isl. 

 Sur v., p. 121) found it necessary to transfer Hecatonema reptans Sauv. to Myriönema 

 and M. spzciosum Borg. to Hecatonema. I follow these authors in placing Petroderma, 

 Lithoderma and Ralf sia with Myriönema. 



