KONGL. SV. VET. AKADEMIENS HANnLINGAR. BAND. 20. N:0 5. 277 



f. arcta KiJTz. (Kjellm.) 



Ectocarpus arctus KuTZ. Phyc. gener. p. 289. 

 Descr. Ectocarpus coufervoides f. arcta Kjellm. Skand. Ect. och Tilopt. p. 71. 

 IBig. Corticularia arcta KiJTZ. Tab. Phyc. 5, t. 80. 

 Exsicc. Ectocarpus pseudosiliculosus Crouan, Exsicc. N:o 27. 



f. siliculosa Dillw. (Kjellm.) 



Conferva siliculosa Dili.w. Conf. p. 69. 

 Descr. Ectocarpus confervoides f. siliculosa Kjellm. 1. c. p. 73. 

 Fig. » siliculosus Lyngb. Hydr. Dan. t. 43, fig. e. 



Exsicc. » » Aresch. Alg. Scand. exsicc. N:o 176. 



f. spalatina Kutz. (Kjellm.) 



Ectocarpus spalatinus KiiTZ. Phyc. gener. p. 288. 

 Descr. Ectocarpus confervoides f. spalatina Kjellm. 1. c. p. 76. 

 Fig. » spalatinus KIjtz. Tab. Phyc. 5, t. 63. 



f. typica nob. 

 Decsr. Ectocarpus confervoides s. s. Kjellm. 1. o. p. 77. 

 Fig. » paténs KiJTZ. Tab. Phyc. 5, t. 67. 



Exsicc. » litoralis var. Aresch. Alg. Scand. exsicc. N:o 111. 



f- penicillata Ag. 



Syst. Alg. p. 162. 

 Descr. Ectocarpus confervoides f. penicillata Kjellm. 1. c. p. 80. 

 Fig. Corticularia Ntegeliana KiJTZ. Tab. Phyc. 5, t. 81. 

 Exsicc. Ectocarpus siliculosus Aresch. Alg. Scand. exsicc. N:o 112. 



f. hiemalis Cbouan (Kjellm.). 



Ectocarpus hiemalis Crouan, Alg. Finist. N:o 26; saltem ex parte. 

 Descr. Ectocarpus confervoides f. hiemalis Kjellm. 1. c. p. 83. 

 Syn. Conferva litoralis Wg. Fl. Lapp. p. 613; ex parte. 

 « siliculosa Sommekf. Suppl. p. 193. 



Ectocarpus confervoides Kjellm. Spetsb. Thall. 2, p. 35; Algenv. Murm. Meer. p. 44. 

 » « Kleen, Nordl. Alg. p. 37. 



" Niegelianus, Gobi, Algenfl. Weiss. Meer. p. 61. 



n siliculosus .1. G. Ag. Spetsb. Alg. Progr. p. 2; Bidr. p. 11. 



M » Croall, F'1. Disc. p. 458. 



» » DicKiE, Alg. Nares, p. 7. 



Remark on the synonymy. 1 have been blamed by Gobi because I have identified 

 Corticularia Ncegeliana Kutz. with that form of Ectocarpus which Areschoug has dis- 

 tributed under the namc of E. siliculosus in Alg. Scand. exsicc. N:o 112. Cp. GoBi 

 Algenfl. Weiss. Meer. p. 61 note 3. As far as I can judge by dried speciraens, there 

 is nothing to prevent such an identification. In branching and in the shape of the 

 gametangia Areschoug's alga resembles the plant figured by Kutzing so closely that 

 they must be regarded as belonging to the same type. The form passes on the one 

 side into E. arctus or E. furcatiis Kutz., on the other sida into E. siliculosus KtJTZ, 



