1922] SetcJiell-Gardner: Phycological Contributions 403 



VI. NEW SPECIES OF ECTOCARPUS 



Since the publication of our account of the Algae of Northwestern 

 America (1903), more or less extensive search and study has been 

 carried on in that same region as well as farther south along the whole 

 coast of North America, with the result that a considerable number of 

 forms of Ectocarpus have been discovered and much more data on 

 previously known forms have been brought to light, necessitating some 

 changes in our previous account and particularly necessitating the 

 founding of several new and quite distinct species. We do not imagine 

 that the field has been, by any means, thoroughly investigated, but we 

 are publishing these findings up to date hoping to stimulate further 

 investigation. Doubtless there are many more undiscovered species 

 and certainly much remains to be worked out regarding life-histories of 

 the various kno'RTi species. The "megasporangia," "meiosporangia," 

 and "antheridia" of Sauvageau (1896, 1896a, 18966, 1896c) offer 

 further and attractive subjects for investigation in the reproductive 

 phase of this group. The nature of the "zoosporangia" or "unilocular 

 sporangia" and the position of the plants which bear them in the life 

 cycle is a matter concerning which but little is known, and which 

 deserves critical study. 



For the sake of uniformity in the method of grouping, in our 

 Pacific coast algological studies, we have found it necessary to name 

 a new Order for use in our forthcoming Part III, the IMelanophyceae, 

 of our 'Marine Algae of the Pacific Coast of North America." The 

 following diagnosis, here published for the first time, sets forth our 

 conception of the group. 



Ectocarpales nom. nov. 



Confervoid (monosiphonous) or solid Phaeosporeae of varying 

 dimensions, habit, and complexity, typically possessing unilocular 

 zoosporangia and plurilocular gametangia and with no portion of the 

 cell membranes turning black with can de Javelle; growth in length 

 strictly apical, subapical ("trichothallic"), or more or less inter- 

 mediate between typical forms of either ; both unilocular zoosporangia 

 and plurilocular gametangia rarely on the same individual in some 

 species, but, most commonly, borne on different individuals, thus point- 

 ing to an alternation of generations, reduction division taking place in 

 the primary nucleus of the unilocular zoosporangia, at least in some 

 species; gametophyte and sporophyte practically indistinguishable as 

 to size and complexity. 



