15G 



become narrower upwards (below the apex 7 — '2,0 //) and downwards (at 

 the base 7 — 23 fi) and are more or less furnished with rhizoids at the 

 base. The specimens had unilocular and plurilocular sporangia, and some- 

 times both kinds of sporangia occurred in the same filament. Tlie spor- 

 angia are both terminal and lateral on the filaments. The plurilocular 

 sporangia are usually about 23 tji thick and attain sometimes a length of 

 ] 08 fi . they have always a shorter or longer stalk, consisting of one to 

 hve or more cells. The unilocular sporangia, hitherto unknown in this 

 form, also usually have a stalk consisting of 1—3 cells, but are occasion- 

 ally sessile; their shape is obovate or ovate, the length 17 — 32// and 



Fig. 1.5. 



Kctocarpiis confervoides (Roth) Le Jol. f. fygnicpa (Arescli.) Kjellin. (l;2(J:l.j 



rt the lowest part of the filament with rhizoids and a unilocular sporangium; 



h a portion with plurilocular sporangia: c, d portions of filaments having both 



unilocular and plurilocular sporangia; e a fragment of a filament with plurilocular 



sporangia showing varying length of the stalk. 



the breadth 14— 22/i, and sometimes they are as long as broad. 1 have 

 now and then observed, that one or more of the upper lateral branches 

 grow long and attain the same thickness as the main axis, which conse- 

 quently becomes displaced. Such specimens form evidently the transition 

 to f. typica. 



f. typica has been found in : 



E. I eel. BerufjorOur; Eskifj6r9ur (Stromfelt) ; SeyOisfjorOur. 



N. I eel. Grjotnes (CO.); Eyjafjor5ur. 



NW. Icel. HrutafjorOur ; IsafjorOur (CO.). 



SW. Icel. Melar, Reykjavik. 



S. Icel. Eyrarbakki, Vestmannaeyjar. 



