Contribution. I. 



53 



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However, the forms, as far as I have seen, are running so 

 gradually into each other that no limit can be drawn between 

 them. In Manual (Ed. 2, p. 184) Harvey unites the pre- 

 sent species with Ch. Daviesii, but in Phyc. Brit. it is again 

 kept distinct, and he ref ers to W y a 1 1, Alg. Danm. No. 189. 

 The plant here distributed I find most essentially coinciding 

 with the form or forms in the Norwegian Polar Sea. 



The species in question is 2—4 mm. high, and the cells 

 have a thickness of 12 — 14 [x. It has beenfound witbrepro- 

 ductive organs at EastFinmarken in July and August, and 

 at West-Einmarken in September. The spores are almost 

 ever solitary, partly sessile and scattered along the branches 

 without any distinct order, partly on a short shaft consisting 

 of 1 — 3 cells, or sometimes in the angle between a short 

 secondary branch and its main axis. The plant is litoral as 

 well as sublitoral. Within the latter zone it has only been 

 found on a depth of 2—3 fathoms. It appears best developed 

 on exposed places but occurs also in sheltered localities, at- 



tached to Cystodoniam imrparascenSj Ehodymenia joalmata^ 

 Rhodomela lycopodioides^ Alaria^ GladopJiora gracilis and some- 

 times also Antithamnion floccosum. 



Distrilmtion: Found at Sværholt, rather scarce; at Me- 



havn, rare; and at Vardo, local but abundant. 



Chantransia secundata (Lyngb.) Thur. 



in Le Jol. Liste Alg. Clierb. p. 106; Callitharanion Daviesii ^ ecun 



datum Lyngb. Hydr. Dan. p. 129. 



Beser. Chantransia secundata Hauck. Meeresalg. p. 41j excl. syn, plur. 



Fig. Callithaninion secundatiim Kiitz. Tab. Phyc. 11, t. 56. 



Exsicc. Trentcpohlia secundata Åresch. Alg Scand. exsiec. Nr. 84. 



Litoral, growing on Forphyra laciniata and Diploderma 

 ampUssimum. It has been found with spores in the begin- 

 ning of August. 



Distribution; Only found at Vardo aud Mehavn^ rare. 



