l86 SAUNDERS [4 22 ] 



The plant is attached to the host in great numbers. It differs from 

 C. californica in its shape, size and the size of the unilocular spo- 

 rangia. The tissue is more delicate, being composed of from two to 

 three layers of colorless cells, a single row of endodermal cells and 

 one of poorly differentiated epidermal cells. 



Coilodesme californica (Rupr.) Kjellm. 



Occasional on Systophyllum lepidum from Puget Sound to Yakutat 

 Bay. Victoria ; Annette Island (38) ; Wrangell (58) ; Yakutat Bay 

 (224). 



No fruiting plants were seen, but the shape and structure of the 

 specimens obtained are the same as in those of the California coast. It 

 is much less abundant in southern Alaska than on the shores of Califor- 

 nia and apparently is wholly replaced further north by C. linearis. 



Coilodesme bulligera Stroemf . 



Abundant on rocks in the littoral zone in quiet coves, from Puget 

 Sound to the Aleutian Islands. Wrangell (58) ; Yakutat Bay (222) ; 

 Prince William Sound (282, 312) ; Kukak Bay (345^) ; Shumagin 

 Islands (3900;). 



Soranthera ulvoides Post & Rupr. 



Saunders, Phyc. Mem. 165. PI. 29, fig. 4 and 5. 



Abundant in the littoral and sublittoral zone, in rather quiet pro- 

 tected places, on rocks, Rhodomela larix, and Rhodamea floccosa. 

 Victoria (2) ; Wrangell (69, 120, 162) ; Yakutat Bay. 



Family DESMARESTIACE^Z. 

 Desmarestia viridis (Muel.) Lamour. 



In the ellittoral and sublittoral zones, Glacier Bay (no) ; Prince 

 William Sound (274) ; not uncommon but less abundant than the next 

 species. 



Desmarestia aculeata (L.) Lamour. 



One of the most abundant of plants in the ellittoral and sublittoral 

 zones from Puget Sound to the Aleutian Islands. Victoria (8) ; Sitka 

 (iSo^ ) ; Wrangell ; Yakutat Bay (226^ ) ; Kukak Bay (322^ ) ; 

 Shumagin Islands (369). 



Family DICTTOSIPHONA CE^E. 

 Dictyosiphon freniculaceus (Huds.) Grev. 



A common plant on rocks, Scytosiphon and other plants from Puget 

 Sound to Bering Strait. Annette Island (42) ; Wrangell (59) ; 



