ICffi 



tm 



M. Fo3lic. 



spores have been coUected in the later half of June, in July 

 and August. At Tromso I have tåken such ones in Octo- 

 ber (/. pcmnosa). 



Distribution: Common and pretty plentiful almost eve- 

 ywhere, at some places, for. inst. Mehavn, abundant (/, ty- 

 pica). The form valida is rather scarce, and /". pannosa has 

 not been found at East-Finmarlien but at West-Finmarken 



■f 



and in Tromso amt. 



Rhizoclonium rigidum Gobi 



Algenfl. Weiss. Meen p. 85. 

 Descr. Rhizoclonium rigidum Gobi, 1. c, 



Exsicc. Conferva fraeta f. longissima subsimplex Aresch. Alg. Scand. ex- 



sicc. Nr. ^73. 

 Rhizoclonium rigidum Wittr. et Nordst. Alg. exsicc. Nr. 626. 

 Cfr. Conferva implexa AVyatt, Alg. Danm. Nr. 142. 



Syn, Cladophora fraeta KIcen, Nordi. Alg. p. 45. 



This species is sometimes, especially in the state bea- 

 ring reproductive organs, somewhat cu^led and twisted. I 

 have specimens collected at East-Finmarken which almost 

 fuUy correspond with Cow/er'^;a im/plexa Wyatt, Alg. Danm. 

 Ni*. 142 even in thickness (25—36 ]^). But the latter is by 

 Le Jolis in Liste Alg. Cherb. p.58referred to Bh. tortu- 

 osum. To my opinion it does not belong to the lastnamed 

 species, being so nearly related to Bh. rigidum that no li- 

 mit hardly may be drawn between them, and I do not 



think 



Wvi 



Conferva tortuosa 



minds of Bh. fortuosum, but it is more slender than the 

 common form of this species. Bh. rigidum has in general, 

 as far a I have seen, a thickness of 18—25 \i. However the 

 specimens distributed by A r e s c h o u g 1. c. is coarser, 

 about 25—35 [k thick. Bh. torkwsum is a smaller plant, 

 has a dark green colour, the threads are 30—45 jx (or, ac- 

 cording to Farlow, 35—58 p.) thick^ andniuch curled m^ 



