41"J rnivcrsH;/ of California Publications in Botany [Vol.7 



Growiiiti: on Fu(i(s. in llic middle of the littoral belt. Pacific Grove, 

 California. 



Erfocarpns ))ara(lo.rus var. pacificus Saunders, Pliyc. ^lein.. 1898, 

 p. 152, 1)1. 18, fifjfs. 4-7; Collins, Ilolden, and Setchell, Phyc. Bor.-Amer. 

 (Exsiec), no. 530. 



Aofordinj? to Saunder.s, hi.s plant, the vai'. pacificus, differs from 

 the type of E. paradoxus IMont., in lacking any manifestation of 

 opposite branching as well as in ha^dng the gametangia longer and 

 more pointed. In these respects and also in that it is a shorter plant, 

 it seem.s to us to be siifificiently distinct to be separated specifically 

 from tlie type, and to be difTerent from any other species known to us. 

 We are consequently dedicating it to its discoverer. 



Ectocarpus simulans sp. nov. 

 Plate 45, figures 9-11 



Frondibus 1-2 nun. altis. floccosis; filamentis prostratis tortuosis, 

 discretis ; filamentis erectis simplieilms. superne leviter attenuatis, non 

 piliferis; cellulis cylindrieis. ad dissepimenta non constrictis, medio 

 11-13/A diam., 1-2.5-plo longioribus quam latis: chromatophoris taeni- 

 atis. parietes cellularum prope exacte tegentibns, pancis; zoosporangiis 

 ignotis; gametangiis lateralibus aut interdum terminalibns. sessilibus. 

 anguste ellipsoideis. obtusis, plerumque leviter curvatis, 55-65/x longis, 

 15-20/A latis. 



Growing on Chaetomorpha aerea. Cypress Point. Monterey County, 

 California. Type, Gardner, no. 3087 (Herb. Univ. Calif., no. 206993). 

 December. 



The present species resembles, in general, certain forms of Ecto- 

 carpus pusillus Griffiths (cf. Sauvagean, 1895), but the erect filaments 

 are much more slender, usually never branched, and with much smaller 

 gametangia. It forms tufts on Chaetomorpha aerea, whose filaments 

 are encircled by the prostrate filaments of the Ectocarpus which form 

 small cushions in their growth over one another. The gametangia are 

 rather blunt and often more or less curved. 



Ectocarpus socialis sp. nov. 

 Plate 46, figures 12, 13 



Frondibus eaespitosis, 1-3 mm. altis, per filamenta rhizoidea dense 

 intrieata et penetrantia affixis; filamentis erectis, ad superficiem 

 ho.spitis. repetite fureatis. superne simplieihns aut alternate-ramnsis, 

 longe attenuates et piliferis; cellulis cylindrieis uscpie ad leviter dolii- 



