[423] THE A1.GJE 187 



Juneau (72) ; Prince William Sound (285) ; Shumagin Islands (341) ; 

 Glacier Bay (96). 



Family BLA CHISTA CE^^. 



Elachista lubrica Rupr. 



Phycotheca Boreali- Americana No. 828. 

 On Rhodymenia falmata in the littoral zone. Wrangell (66) ; 

 Glacier Bay (83) (loi) ; Prince William Sound (306) ; Yakutat Bay 

 (242). 



Family CHORDARIACE^E. 



Myrionema strangulans Grev. (Plate xlvi, figs. 1,2.) 



On Ulva lactuca. Sitka (146). Abundant also on the California 

 coast. 



Eudesme virescens (Carm.) J. Ag. 



Not uncommon on rocks and Zostera marina in the sublittoral and 

 littoral zones. Sitka (i 15-177); Glacier Bay (194); Shumagin 

 Islands (406^4 ) ; Prince William Sound (284). 



The specimens from Prince William Sound are somewhat doubt- 

 fully referred to this species. The plant is much smaller than the other 

 specimens, much more branched throughout and of a light yellow color, 

 resembling in these respects Zanardini's E. Jlavescens. The micro- 

 scopic structure however is identical with that of E. virescens. 



Leathesia difformis (L.) Aresch. 



On rocks and algae in the littoral zone from Puget Sound to the 

 Shumagin Islands. Victoria (2}4) ; Annette Island (32) ; Wrangell 

 (7oj4) ; Sitka (142) ; Yakutat Bay (254). 



Mesogloia simplex sp. nov. (Plate l, figs. 3, 4.) 



Plant soft mucous, olive-brown, unbranched, tubular or intestini- 

 form, hollow, rounded above, narrowed below to a short indistinct 

 stipe ; central filaments few, distinct, irregularly branched ; peripheral 

 filament short, simple, 2-3-4-celled ; unilocular sporangia ovate or 

 elliptical, pyriform, 15-25 /i by 25-35 /j, arising from the subcortical 

 area. 



In structure this plant very closely resembles Gohia^ agreeing closely 

 with Gobi's figure and description, but lacks the parenchymatous 

 structure of that genus. It is no doubt one of the Chordariacece^ 

 which is given this somewhat provisional name until the plurilocular 

 sporangia are found. 



Attached to old worn plants of Chordaria abietina. Sitka (128). 



