Vol.1] Sffchell-Gardner. — Algre of Northtcestern America. 215 



L. M. Turner, No. 849 (Herb. U. S. National Museum) ! , ]l'.A..S., 

 Nos. 5235!, 5248x!, and in Collins, Holden and Setchell, 

 P. B.-A., No. 969!, under Uoniiidiinii parietinum; St. Paul 

 Island, Alaska, B. ^y. ^(vmr/w !( Setchell, 1889, p. 590) ; Iliuliuk, 

 Unalaska, Alaska, W.A.S. and A.A.L., No. 4010!; St. Paul, 

 Kadiak Island, Alaska, Tl^A.iS'. and A.A.L., No. 5137! , Saunders 

 (1901, p. 412, under Rormidium parietinum) ; Orea, Alaska, 

 .T1^A.^\ and A. A. L., Nos. 5182!, 5183!; Yakutat Bay, Alaska, 

 Saunders (1901, p. 412); Juneau, Alaska, ir.A./S. and A.A.L., 

 Nos. 5191!, 5192!: Departure Bay, Vancouver Island. B. C, 

 W.A.S.and A.A.L.. No. 5211!; Coupeville, Wliidbey Island, 

 Wash.. X.L.a., (569! 



The specimens quoted above include all sorts of conditions 

 from the typical P. rrispa with its broad flat frond, to filamen- 

 tous forms referable to Horniidimn parietinum (Vaucher) Kuetz- 

 ing or even to H. murale (Lyugbye) Kuetzing. In the majority of 

 cases, these forms are mixed in the same collection and often show 

 more or less perfect transitions from the one to the other. 



Prasiola calophylla (Carmichael) Meneghini. 



In l)rackish water at the head of Penn's Cove, Wliidbey 

 Island, Wash., X.L.G., No. 258! 



This narrow species contrasts veiy decidedly with P. rrispa 

 as well as with the next two species in the shape of the frond and 

 the arrangement of the cells. W^e have been unable to compare 

 it with authentic specimens but it answers to the descriptions and 

 the figures so exactly that we feel little doubt concerning it. 



Prasiola borealis Reed. 



On rocks, just above high water mark. Iliuliuk, Unalaska, 

 Alaska. W.A.S. and A.A.L., Nos. 4013!, 4021!; St. Paul, 

 Kadiak Island, Alaska, W.A.S. an -J A.A.L., No. 5138! 



This s])ecies comes nearest to P. Anfarcfiea Kuetzing, but dif- 

 fers from it in shape and color of the fronds and in the less 

 regular tetrad arrangement of the cells. The specimens of P. 

 borealis are infested with a fungus {Guignardia Alaskana Reed) 

 just as the Antarctic species is with Guignardia Prasiohe 

 (Winter) Reed, which gave rise to the genera Masfodia Hooker 

 and Harvey and Dermaiomeris Reinsch. For further details 



