515 
richly branching, are met with which I have referred to this 
species 1 . 
Judging from the examples, which according to my definition 
are referable to CL sericea, the species grows mostly on fairly ex¬ 
posed coasts in high-lying rock-pools, but it can also be met 
with in places which are somewhat sheltered. 
Fruiting specimens were found in April—May. 
It is hardly rare around the coasts of the Faeroes. 
194. Cl. gracilis (Griff.) Kiitz. Conferva gracilis Aresch., Phycese 
Scand. mar., p. 197. 
The specimens referred to this species agree fairly well with 
No. 97 quoted by Areschoug in Wyatt, Alg. Damn. The ramifica¬ 
tion in the Faeroese plants though sometimes somewhat unilateral, 
especially at the apex of the branches, is never decidedly so, as is 
the case in Areschoug’s fig. B (tab. II). In their mode of branching 
the Fa3roese specimens are also somewhat similar to Lyngbye’s 
figure (fig. 54 A) of the plant he calls Conferva crystallina p virescens, 
which figure Areschoug quotes under his var. p of Cl. gracilis . 
As may distinctly be seen in Lyngbye’s figure, two unilateral 
branches often spring from the same joint in the main branch, 
and just the same mode of branching occurs also frequently in the 
Fseroese specimens. Some of the plants referred to this species 
somewhat reminded one in habit of the specimens of CL glaucescens 
f. scrobiculorum Kjellm. distributed by Kj ell man in Wittr. and 
Nordst. Exsicc., Fasc. 22, No. 1037. The main branches attain to a 
thickness of up to 200 g; the thinner branches are 30—50 g thick. 
The dried specimens are of a pale, yellowish-green colour. 
1 As also pointed out by Reinbold (1. c. pp. 135—7) there is a great deal of 
uncertainty regarding the definition of this species, and we very often find that 
characters regarded by one author as peculiar for this species differ altogether 
from those pointed out by another as such. Kj ell man also in his introduction 
to »Studier ofver Chlorophyceslagtet Acrosiphonia«, where he announces the pu¬ 
blication of a second part of bis »Handbok i Skandinaviens hafsalgflora« which is 
to contain a list of the marine Chlorophyceae of Scandinavia, emphasizes the fact, 
that by the help of the material in hand it is impossible to arrive at any definite 
conclusion regarding the Cladophoracece occurring along the coasts of Scandinavia. 
Kjellman has already given some determinations in Wittr. et Nordst. Exsicc., 
Fasc. 22, and these determinations show that he differs in several points from his 
previous opinion as expressed, e. g. in »Norra Ishafvets Algflora«; but until his 
completed work is published the specimens in the above-mentioned Exsicc. having 
only names attached to them, merely help to increase the difficulties. 
Botany of the Faeroes. 33 
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