KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 61. NIO IL 



43 



noteworthy that every branch bas a terminal hair-pit. The hair-pits are quite shal- 

 low, whicli is easy to understand as the cortex never attains any considerable thick- 

 ness. I do not know if the sori are originally formed round the hair-pits; in the old 

 plants — the only kind observed — they do not form distinct areas but cover all the 

 adult parts of the frond. As far as my experience goes nothing like Cladochroa bas 

 been described before. 



UJSlö 



Fig. 17. Cladochroa chnoosporiformis : a^ontire speciraen, half natural size; b part of plant, X20; c cross section, show- 

 ing development of assimilators, X 3<>0; d id. with assimilators and sporangia, X 300; C id. through hair-pit, X 180; 



f long. section through fertile frond, X 180. 



Sphacelariaceae. 

 Halopteris Kutz. 



H. obovata (Hook. fil. et Harv.) Sauv. 



S. Patagonia: Otway Water, Puerto Toro on drifted specimens of Clado- 

 stephus (15. 4. 08, sp.); Canal Fitzroy, Los Amigos, drifted (St. 17 b, 19. 4. 08). 



Distribution: Subantarct. Amer., Falkl., S. Georgia. 



