— 157 — 



f. pygmcea is only known fiom : 

 SW. I eel. ViOey. 



Ectoearpus siliciilosus (Huds.) Lyngb. Hydr. Dan. p. 131, Kjellm. 

 Handbok p. 78, Kuck. Ectoc. p. 15. 



This species occurs in the litoral region on other algae e. g. Chordaria 

 flagelliformis. Chorda Filum, Scytosiplion lomentarius, and in the sublitoral 

 region down to a do{)th of 4 fathoms on Saccorhiza dermatodea and spe- 

 cies of Laminaria. Gathered witli plurilocular sporangia in April and 

 Jiine — August. The Icelandic specimens agree well with the typical form. 

 The thickness of the main branches is from 50/^ — 60// in the middle, 

 but upwards and downwards the filaments become narrower. Sometimes 

 the filaments are here and there surrounded by a mantle of rhizoids. 



Probably common. 



N. I eel. EyjafjorCiur. 



NW. I eel. HrutafjorOur, KoUafjorJur. 



SW. I eel. Melar, Skogarnes, ViOey. 



Ectocarpiis penicillatus (Ag.) Kjellm. Handbok p. 76; E. eonfervoides 

 f. penicillata Kjellm. Bidrag p. 79. 



I have met with this species here and there, growing on other algtv 

 e. g. Scytosiphon lomentarius in the litoral region and on Alaria esculenta 

 and Laminaria digitata in the sublitoral region down to a depth of "2 

 fathoms. 



E. Icel. BerufjorOur, Sey5isfj6ri3ur. 



N. Icel. Grfmsey (0. D.); EyjafjorOur. 



SW. Icel. Grimsey in HvammsfjorOur, Stykkisholmur; HvalfjorOur 

 (Gronlund) ; Reykjavik. 



Ectoearpiis fasciciilatiis (Griff.) Harv., Kjellm. Handbok p. 76. 



I have met with this species in the litoral region growing on other 

 Algoe e. g. Rhodymenia palmata, and in the sublitoral region on lamina 

 and stipe of species of Laminaria and on Alaria esculenta. At Vesl- 

 mannaeyjar it often occurred gregariously on Laminaria digitata f. steno- 

 phylla. It has been gathered with plurilocular and unilocular sporangia 

 in May— July. Both kinds of sporangia are sometimes to be found in the 

 same specimen. As a rule the unilocular sporangia are, as the pluriloculai- 

 ones, unilaterally situated on the upper side of the branches, especially 

 in the middle branches. They are sometimes exceedingly dense and are 

 somewhat resembling the sporangia of E. [)yenoearpus Rosenv. (Grl. Havalg. 

 p. 886, fig. B and C) and agreeing with the figure given by Borgesen 

 (Feer. Alg. p. 411, fig. 71, a). In the lower part of the main axis I have only 

 seen some few and scattered sporangia and towards the apex they also 



Botanisk Titlsskrift. 25. Bind. j^ 



