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



f. arcta KiJTZ. (Kjellm.) 



Ectocarpus arctus KiJTZ. Phyc. gener. p. 289. 

 Descr. Ectocarpus confervoides f. arcta Kjellm. Skaiid. Eot. och Tilopt. p. 71, 

 Big. Corticularia arcta KiJTz. Tab. Phyc. 5, t. 80. 

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



f. siliculosa Dillw. (Kjellm.) 



Conferva siliculosa Dillw. 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 KiJTZ. Phyc. gener. p. 288. 

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

 Fig. " spalatinus Kuxz. Tab. Phyc. 5, t. 63. 



f. typica nob. 

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

 Fig. a patens KiJTZ. Tab. Phyc. 6, 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 Neegeliana KiJTZ. Tab. Phyc. 5, t. 81. 

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



f. hiemalis Crouan (Kjellm.). 



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

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

 Syn. Conferva litoralis Wg. F1. Lapp. p. 513; ex parte. 

 » siliculosa Sommerf. Suppl. p. 193. 



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

 » « Kleen, Nordl. Alg. p. 37. 



» Nsegelianus, Gobi, Algenfi. Weiss. Meer. p. 61. 



» siliculosus .T. G. Ag. Spetsb. Alg. Progr. p. 2; Bidr. p. 11. 



» » Croall, F1. 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 name 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 specimens, 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 KtJTZiNG 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. furcatus Kutz., on the other side into E. siliculosus Kutz. 



