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Remarks on forms of Ectoearpus and Pylaiella. 



By 



M. F o slie. 



Some years ago I collected at West-Finmarken a Py- 

 laiella, growing in rock-pools between tides vand partly floa- 

 ting on the surface of the water, which I provisionary re- 

 ferred to P. varia Kiel lm., and I distributed some few 

 specimens of it under that name. After a more oareful exa- 

 mination I have,' however, found that this form really is to 

 be referred to P. Ittoralis f. compacta 1 . But in several re- 

 spects it reminds one of P. varia, and especially as to the 

 sporangia it approaches so closely to this species, that a li- 

 mit hardly can be drawn between them. The plant has most 

 nearly the habit of P. Moralis f. compacta. It is irregular- 

 ly branched, the branches are seldom opposite, issuing in an 



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angle of 30—90°, mostly 60—- 90°, more or less curved and 

 nearly eqnalin diameter throughout, and even upwardspro- 



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Pylaiella Ittoralis y divaricata Kj ellm. Handbok p. 85 is, as far 

 as I am able to judge, identic witli P. Ittoralis f. compacta in 

 KjeHm. Skand. Ect. o. Tilopt. p. 105, Hauck, Meeresalg. p. 341, 

 Ectoearpus compactus Kiitz. «peo. Alg. p. 458 and Tab. Phyc. 

 5, t. 76. I do not find.it necessary to change the name and, there- 

 fore, I keep the old one, which commoniy bas been used for the al- 



ga in question. 



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