41 8 SAUNDERS 



Ectocarpus confervoides (Roth) Le Jol. 



On rocks in Yakutat Bay (226^). 



This plant comes very close to the typical form of the species, it is 

 10 or more centimeters long, closely intertwined, the branches few, 

 ateral, and secund, 20-40 /jt broad at the base, the ultimate ones short 

 and pointed ; plurilocular sporangia ovate, sessile or short stalked, 

 borne laterally on the main branches, especially abundant on the short 

 ultimate ones, 20-30 /i, by 40— 8o/ji long. 



Ectocarpus confervoides corticulatus Saunders. 



Ectocarpus corticulatus SwanKKS, Phyc. Mem. 152.//, 20. 



On Des77iarestia aculeata^ Popof Island (36S). 



This species is the same as that described from the California coast 

 though the tufts are longer, and only the main filaments and the lower 

 part of the long primary filaments are uniformly corticated. After 

 examining a large amount of material of this and several other varie- 

 ties of E. confervoides the writer is convinced that E. corticulatus 

 should be considered as a variety of E. confervoides. 



The plant is of a light olive green, forming flocculent tufts a few 

 mm. to 5 cm. or more in length, the main filament and lower part of 

 the primary branches densely corticated, 60-100 /x broad, ultimate 

 branches short, bearing numerous ovate plurilocular sporangia 16-25// 

 broad, and 40-70 // long. 



Ectocarpus confervoides pygmaeus (Aresch.) Kjellm. 



Forming a velvety covering or minute tufts on various algag, from 

 Pugct Sound to the Shumagin Islands. Yakutat Bay (439) ; Shumagin 

 Islands (386). 



The plant is 2-15 mm. high, sparingly branched ; filaments 10-20 /x 

 broad, 2 to 3 times as long. 



Pylaiella littoralis (L.) Kjellm. acuta, form. nov. 



Plant 3—10 cm. or more long, loosely disposed ; main filaments 25- 

 40 ji wide, branches few, alternate or opposite, ultimate filaments 

 short, pointed, but not pilate ; unilocular sporangia in the ultimate 

 branches 18-24 /^ broad, 5-15 or more in a chain. 



This plant agrees with the variety opposita Kjellm. in its general ap- 

 pearance but is smaller in all its parts and is not pilate. 



Very abundant from Wrangell westward to the Aleutian Islands. 

 Kukak Bay (322). 



The plants form large loose tufts on Fucus evanescens macrocephala 

 and occasionally on rocks in all quiet coves. In several instances it 

 was found extending up brooks much beyond the mean tide level. In 



