482 



man's description. They occufred as endophytes in different Flo- 

 rideæ, e. g. Polgides rotundiis, Furcellaria fastigiata and Chondrus 



crispus. 



Found hitherto in thc following piaces: — Bordo: Klaksvig (H. J.); 

 Str.: Thorshavn (!) ; Nolso (!); Syd: Trangisvaag (H. J.). 



Order PRASIOLACEAE. 

 PRASIOLA (Ag.) Menegh. 



159. P. crispa (Lightf.) Menegh. 



■marina nov. subspec. Schizogonium radicans Foslie, Contri 

 bution I, p. 128 (e specim.); Gayella polyrhiza Rosenv., Grønl. Havalg., 

 p. 936 (e specim.); Ulothrix discifera Batters, A List of the Marine 

 Algæ of Berwick-on-Tweed, p. 258 (e specim.); Prasiola crispa f. sub- 

 marina Wille, Studien fiber Chlorophyceen, III. Eine submarine Form 

 von Prasiola crispa (Lightf.); (?) Ulothrix discifera Kjellm., Om Spets- 

 bergens mar. klorofyllf. Thallophyter, II, p. 52. 



On steep rocks facing the open sea I have several times ob- 

 served a small alga which often occurred in great abundance and 

 was very conspicuous on account of its fresh, light yellowish-green 

 colour when dry. Thus, it occurred abundantly on the rocky coast 

 between Skandsetangen near Thorshavn and Hojvig. In order to be 

 able to compare it with the rather widely differing species of different 

 authors which I have grouped above, and all of which according 

 to my opinion ought to be included under this species, I will here 

 shortly describe the Færoese specimens. They consist originally and 

 for the most part of cell-filaments (about 10 — 12 \i thick) formed of 

 disc-shaped cells which are generally only about one-third as long 

 as broad, though they are sometimes met with as long as they are 

 broad. Now and then, and most commonly at fairly regular intervals 

 rhizoids arise, generally two together, but occasionally also singly; 

 the cells whence these arise are mostly longer than the others in 

 thc lilament. These rhizoids are generally connected with the 

 moUier-cell, and the chromatophore contained in the latter is con- 

 tinued into the former. But sometimes I have observed rhizoids 

 divided into several cells (see fig. 99, i, j) as Wille (1. c. p. 15, lig. 53) 

 also menlions having done in a single instance. While, on the 

 one hånd, the single rhizoids, shown in lig. 99, /, perhaps mav be 

 regarded, in conformity with Wille's opinion, as an abnormal 

 formation, on the other band, thc two illustrated in lig. 99, /, appear 



