292 University of California Publications. i botany 



The type is Diploderma variegatam Kjellman (1889, p. 33, 

 pi. 2, f .-, 1-4) from Bering Island, Siberia. The species is read- 

 ily recognized by its thick and variegated frond. To this species 

 must be joined P. occidentals Setchell and Hus (Hus, 1900, p. 

 69 and 1902, p. 228, pi. 21, f. 15a-17b), since farther search on 

 the coast of California has brought other more luxuriant, thicker 

 specimens to light and it has been made certain that it is the 

 antheridial plant of P. variegata. 



Erythrotrichia ceramicola (Lyngbye) Areschoug. 



On Lophosiphonia villum. St. Paul, Kadiak Island, Alaska, 

 W.A.S. and A.A.L., No. 5148a! 



Family HELMINTHOCLADIACE^. 



Batrachospermum monilforme Roth. 



Chilukweynk Valley, Vancouver, Island, B. C, Harvey 

 (1SG2, p. 176). 



We know this only from the reference and consequently do 

 not know whether it is B. moniliforme in the sense of Sirodot or 

 not. The species of this genus have not been sufficiently studied 

 as yet, but we shall attempt to refer ours to the species of 

 Sirodot 's monograph, at least provisionally. 



Batrachospermum moniliforme f. typicum Sirodot. 



In fresh water streams. Baird Creek, Port Renfrew, B. C, 

 Tilden, No. 332!, under B. moniliforme var. Scopula; Port Ren- 

 frew, B. C, Butler and Polley and in Collins, Holden and 

 Setchell, P. B.-A., No. 876! 



The two collections cpioted above seem to be typical of this 

 species as we understand it. The cystocarps are of uniform 

 size, not large, and situated in the outer half of the verticil but 

 well included. 



Batrachospermum moniliforme f. helminthoideum Sirodot. 



In a creek. Orcas Island, Wash., N.L.G., No. 702.! 



We have some doubt of the determination of this plant, but it 

 seems to agree with the description of Sirodot. It differs from 



