515 



richly branching, are mel with which I have referred lo this 

 species 1 . 



Judging from the examples, which according to my definition 

 are referable lo Cl. sericea, the species grows mostly on fairly ex- 

 posed coasts in high-lying rock-pools, hul il can also be mel 

 with in piaces which are somewhat shellered. 



Fruiting specimens were ibnnd in April — May. 



Il is hardly rare around the coasts of the Færoes. 



194. Cl. gracilis (Griff.) Kiitz. Conferva gracilis Aresch., Phyceæ 

 Scand. mur., p. 197. 



The specimens referred to this species agree fairly well with 

 No. 97 quoted by Areschong in Wyatt, Alg. Danm. The ramifica- 

 tion in the Færoese piants though sometimes somewhat unilateral, 

 especially at the apex of the branches, is never decidedly so, as is 

 the case in Areschoug's fig. B (lab. II). In their mode of branching 

 the Færoese specimens are also somewhat similar to Lyngbye's 

 lign re (fig. 54 A) of the plant he calls Conferva crijslallina |9 virescens, 

 which lignre Aresch o ug quotes under his var. § of Cl. gracilis. 

 As may distinetly be seen in Lyngbye's ligure, 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 

 Færoese specimens. Some of the piants referred to this species 

 somewhat reminded one in habit of the specimens of Cl. glaucescens 

 f. scrobiculorum Kjellm. distributed by Kjell man in Wittr. and 

 Nordst. Exsicc, Fase. 22, No. 1037. The main branches attain to a 

 thickness of up to 200 f*; the thinner branches are 30 — 50 n thick. 

 The dried specimens are of a pale, yellowish-green colour. 



1 As also pointed out by Heinbold (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. Kjell man also in his introduction 

 to »Studier ofver Chlorophycéslågtet Acrosiphonia«, where he announces the pu- 

 blication of a second part of his »Handbok i Skandinaviens hafsalgflora« which is 

 to contain a list of the marine Chlorophyceæ of Scandinavia, emphasizes the faet, 

 that by the help of the material in hånd it is impossible to arrive at any definite 

 conclusion regarding the Cladophoraceæ occurring along the coasts of Scandinavia. 

 Kjell man has already given some determinations in Wittr. et Nordst. Exsicc, 

 Fase. 22. and these determinations show that he dillers in several points from his 

 previous opinion as expressed, e. g. in »Norra Ishafvets Algflora : hut until his 

 completed work is published the specimens in the above-mentioned Exsicc. having 

 only uames attached to them merely help to increase the difficulties. 

 Botan; of tbe Færoes. 3;{ 



