518 
* Among the species kindly communicated to me by Foslie there 
are several that accord nearly with C. gregarium Al. Braun in re¬ 
gard to the shape of the club-head. I think I ought to point out 
this fact because it shows that C. longipes is a species very slightly 
differentiated from C. gregarium«. I may further re¬ 
mark that among the very rich material which I had 
for examination from the Faeroes some specimens 
were found which appeared to correspond exactly 
with C. Nordenskioldianum Kjellm. On the whole I 
think that Kj ell man is right when he says in his 
description of C. Nordenskioldianum in N. I., p. 390 
(318—9) that the genus Codiolum has been shown to 
possess a great many species differing very slightly 
from one another, which perhaps ought properly to 
be referred to the same species. On examining the 
specimens in the different Alg. Exsicc. at my dispo¬ 
sal I have, however, arrived at the conclusion that it 
is most natural to maintain the two first-described 
species, C. pusillum and C. gregarium 1 which are in 
fact fairly different from each other and I should 
propose to refer the other species to these as re¬ 
presenting different forms of one or the other. 
The head of the Fseroese specimens measured 
about 135—150// in length and 54/*, in breadth and 
the stem about 250// in length and 15// in breadth. 
This plant has been found on sheltered as well 
as on open coasts; it grows in the littoral zone near 
high-water mark or above it, and forms a thin, 
Fig. io7. codioium pu- green, slimy covering on rocks, pales or such like 
siiium (Lyngb.) Kjelim. pi ace s often in association with Prasiola, Urospora 
mirabilis, Ulothrix, etc. 
Specimens bearing zoospores were found in June, October, No¬ 
vember and December and the plant occurred, on the whole, most 
abundantly in October, November and December. 
This species has been found in the following places: — Vid.: 
Kvannesund (H.J.); Str.: Thorshavn (H.J.!); Store Dim on (!); Syd.: Tran- 
gisvaagfjord several places (H. J.), Famien (!). 
197. C. pusillum (Lyngb.) Kjellm., N. I., p.389 (318); Vauclieria 
pusilla Lyngb., Hydrophyt., p. 79, tab. 22. 
1 Naturally with the exception of Codiolum Petrocelidis Kuck. 
