363 



Tetraspore-bearing piants were Found in .lune, and November, 

 cystocarpic in June, Jury und August. Kl een found il bearing 

 cystocarps in July and August in Nordland. 



This species is quite commoo along the shores of the Færoes and 

 was lirsl mentioned by Lyngbye. 



Order RHODYMENIACEAE. 

 RHODYMENIA Grev.) J. Ag. 



26. Rh. palmata (L.) Grev. Kjellm., N. L, p. 188 (147); Ulva pal- 

 mata Lyngb., Hydrophyt., p. 24. 

 Formå typica Kjellm., 1. c. 



subf. caespitosa Simmons, 1. c. p. 266. 

 Formå prolifera Kutz. Flora Danica, tab. 1128, 



subf. nana, nov. subf. 

 1—3 cm. higb, very prolific and branched; the base more or 

 less cuneate and sometimes drawn out into a small stalk. 



The easiest transitional stages are met with between the above- 

 mentioned forms, but as they differ widely in their typical deve- 

 lopment, and there seems to be some dissimilarity in their habitats, 

 f. typica growing most commonly on rocks while f. prolifera usually 

 occurs epiphytically, I have thought it more practical to keep them 

 apart from each other. F. tijpica is very variable, at times having 

 prolifications (f. marginifera Harv.), at others being quite destitute 

 of them (f. nucla); sometimes it is broad, sometimes the segments 

 of the thailus are narrow and numerous, and a few such specimens 

 in my collections resembled fairly closely f. sarniensis. With regard 

 to subforma cæspitosa Simmons — through the kindness of Dr. 

 Nordstedt I have had some specimens for examination from the 

 collection belonging to the University of Lund and have thus been 

 able to ascertain that these belong to f. typica — , it may be re- 

 marked that some specimens occur whieh correspond to Simmons's 

 description, but they are often destitute of stipe, and are charac- 

 terized especially by their small size and tufted or carpet-like 

 growth, often covering large areas. Subforma nana is likewise 

 only a very small form of f. prolifera, at the most a few inches 

 high, and similarly marked by its carpet-like gregarious growth. 



In a few rare instances some olherwise normal specimens of 

 f. typica and subf. cæspitosa had part of their thailus transformed 

 into small, irregularly shaped growths (tig. 55) by their very copious 



