363 
Tetraspore-bearing plants were found in June, and November, 
cystocarpic in June, July and August. Kleen found it bearing 
cystocarps in July and August in Nordland. 
This species is quite common along the shores of the Faeroes and 
was first mentioned by Lyngbye. 
Order RHODYMENIACEAE. 
RHODYMENIA (Grev.) J. Ag. 
26. Rh. palmata (L.) Grev. Kjellm., N. I., p. 188 (147); Ulva pal- 
mata Lyngb., Hydrophyt., p. 24. 
Forma typica Kjellm., 1. c. 
subf. caespitosa Simmons, 1. c. p. 266. 
Forma prolifera Kiitz. Flora Danica, tab. 1128, 
subf. nana , now subf. 
1—3 cm. high, 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. typica is very variable, at times having 
prolifications (f. marginifera Harv.), at others being quite destitute 
of them (f. nuda); sometimes it is broad, sometimes the segments 
of the thallus are narrow and numerous, and a few such specimens 
in my collections resembled fairly closely f. sarniensis. With regard 
to subforma ccespitosa 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 which 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 otherwise normal specimens of 
f. typica and subf. ccespitosa had part of their thallus transformed 
into small, irregularly shaped growths (fig. 55) by their very copious 
