138 



M. Foslie. 



: > 



1^ . 



ler, usnally 4—6 cm. long, of a rather dark green colour, 

 robust, densely branched, sometimes forming roundish "balls, 

 and in the lower part of the frond often very coarse with 

 thick cell-wals. I have distributed this form under the na- 

 me of Cl. gracilis f. horealis. But as yet I am uncertaln 



L 



whether it may be regarded more than a local variety of 

 the species. The plant is generally smaller along the north- 

 em coast of Norway than more south. However I have 

 seen British specimens detennined by Harvey which al* 

 most fuUy coincide with Finmarkian ones of the normal 

 fotm. On the other hand the species sometimes approaches 

 nearley to Cl. glaucescens. Cp. Witt r. et Nord st. Alg. 



exsicc. Nr. 620. 



The present species is litoral and grows in pools in 

 the upper part of the zone. It occurs both on open and 

 sheltered coasts, but it seems to prefer protected places. 

 Specimens with zoospores have been collected in August. 



Disfribution: Pretty common along the whole coast 

 and at serveral places plentiful. 



Gen. Rhizoclonium Ktitz. 



Phye gener. p. 261. 



Rhizoclonium riparium (Roth) Harv. 



Phyc. Brit. t. 238; Conferva riparia Roth, Cat. Bot. 3, p. 216, 



f. typica Wittr. 



in Wittr. et Nordyt. A]g. exsicc. Nr. 623. 

 DesGT. Rhizoclonium riparium f. typica Wittr. 1, c. 



Fig. 



Exsicc. 



» 



n 



Harv. Phyc. Brit. t. 238. 

 Wittr. et Nordst. 1. c. 



Cfr. Conferva impleia Areach. Alg. Scand. exsicc. Nr. 135. 



f, valida Fosl. 



in Wittr. et Nordst. Alg. exsicc. Nr, 6Si4. 



DescT. Blii^OQlonium riparium ft valida Fosl, 1. Ct 



