398 University of California Publications in Botawy [Vol. 3 



Chaetopteris plumosa (Lyngb.) Kuetz. 



Frond terete, 7-11 cm. high, the lower portion stipe-like and 

 undivided, arborescent above, with the principal branches alternate 

 or opposite; the stipe and principal branches nude; the primary 

 branches closely beset with pinnate branches; pinnae distichous, strict, 

 unbranched, 5-8 mm. long; branches arising from the medulla; color 

 of main branches dark, of the pinnae, olive brown, turning green on 

 drying; unilocular sporangia spherical, plurilocular gametangia cylin- 

 drical, both borne on short lateral pedicels. 



Growing in the sublittoral belt. St. Lawrence Island and Pt. 

 Clarence, Alaska. 



Kuetzing, Phyc. Gen., 1843, p. 293 ; Tab. Phyc, vol. 6, 1856, pi. 6, 

 fig. I; Setchell and Gardner, Alg. N.W. Amer., 1903, p. 239; Kjellman, 

 Om Beringh. Algfl., 1889, p. 51. Sphacelaria plumosa Lyngbye, 

 Hydrophyt. Dan., 1819, p. 103, pi. 30c. 



The occurrence of this species on our coast is known to us only 

 from the reference of Kjellman. 



Order 2. ECTOCARPALES s. and g. 



Confervoid (monosiphonous) or solid Phaeosporeae of varying 

 dimensions, habit and complexity, typically possessing unilocular zoo- 

 sporangia and plurilocular gametangia and with no portion of the cell 

 membranes turning black with eau de javelle ;.growth in length strictly 

 subapical, often ' ' trichothallic, ' ' or more or less intermediate between 

 typical forms of either ; both unilocular zoosporangia and plurilocular 

 gametangia in the same individual in some species, but, most commonly, 

 borne on different individuals, thus pointing toward an alternation of 

 generations, reduction division taking place in the primary nucleus of 

 the unilocular zoosporangium ; gametangia all similar or slightly differ- 

 ing in number and size of loculi ; gametophyte and sporophyte prac- 

 tically indistinguishable as to size and complexity. 



Ectocarpales Setchell and Gardner, Phyc. Cont. VI, May 16, 1922, 

 p. 403 (lim. mut.) ; Oltmanns, Morph. und Biol, der Algen, vol. 2, 

 1922, p. 2 (lim. mut.). Ectocarpaceae Oltmanns, Morph. und Biol, der 

 Algen, vol. 1, 1904, p. 350 (in part). Ectocarpineae Taylor, Recent 

 Studies of Phaeophyceae, etc., Dec, 1922, p. 436 (in part). 



It seems more consistent with Jlie present usage in other subclasses 

 of the thallophytes to consider the extended Ectocarpaceae of Oltmanns 

 as an Order rather than as a Family. Oltmanns in the last edition 



