447 



from East-Finmarken to f. typica, so I am of opinion that all the 

 Færoese specimens mav be referred to this form. 



This species grows holli on l'airly exposed shores and in 

 sheltered localities, but is most eommon in the latter. It generally 

 occurs in the subliltoral zone, but not at any considerable depth; 

 where the tide is not felt it is eommon in 1 to 2 feet of water. 

 Most frequeatly it is found attached to stones, but may also occur 

 epiphytic on larger algæ. 



Sporangia-bearing plants were found in November and De- 

 cember, but the summer specimens which I have examined were 

 sterile. 



This species is quite eommon along the Færoese coasts and was 

 already found by I . y n g b y e. 



CASTAGNEA Deri), el Sol. 



140. C. virescens (Carm.) Thur. Le Jolis, Alg. mar. de Cherb., 

 p. 85; Eudesme virescens ,1. G. Ag., Kjellm., N. I., p. 312 (251). 



Found in a sheltered situation in quite shallow water growing 



on stones. It had sporangia in July. 



It appears to be very rare along the coasts of the Færoes as it 

 has been found once only, and in a small quantity, in Sundene on the 

 coast of Stromo between Thorsvig and Kvalvig (!). 



LEATHESIA (Gray) J. G. Ag. 



141. L. difformis (L.) Aresch. Kjellm., N. I., p. 313 (252). 



It belongs to the littoral zone and has been mostly met with 



in sheltered localities. It generally occurs as an epiphyte on Co- 



rallina officinalis, but also grows on rocky bottoms. It was found 



bearing plurilocular sporangia in July. 



Found in the following localities: —Ost.: Ejde (H. S.), Selletræ (H.S.); 

 Str.: Kollefjord (H. S.), Kalbakfjord (!), Thorshavn (H. S.); Syd.: Trangis- 

 vaagfjord (,11. S.. Simmons, 1. c. p. 270, mentions it on the whole as 

 eommon: — »als Epiphyt in der Corallinaformation , wo sie selten zu 

 fehlen scheint<. The reason why Simmons found it so frequently is 

 doubtless that it is most luxuriantly developed at the end of summer. 



Order CHORDACEAE. 

 CHOHDA (Stackh.) Lamour. 



142. Ch. filum (L.) Stackh. Lyngh., Hydrophyt., p. 72; Kjellm., 

 N.I., p. 307 (245); Reinke, Atlas, tab. 26— 28. 



