V'OL. 1] SetcheU- Gardner. — Alga' of J^'orfhwesfern America. 325 



Pteridium? serratum t. platyphyllum Setchell and Uaidner 

 f. nov. 



Fronds up to 10 em. high, subdichotomous below, regularly 

 alternately pinnate above, rose red, linear, entire, with promi- 

 nent midril) and microscopic lateral veins. The width varies 

 from 5 mm. in the lower part, to '2 mm. jnst ])elow the tips of the 

 branches. Sori on each side of the midril) and ascending along 

 the microscopic veins, continuous from near the l)ase to just below 

 the tips. Cystocarps?. 



On a wooden float. Pleasant Beach, Kitsap County, Wash., 

 X.L.G., No. 344! 



Answering very well to the description of Pt. .'<errafi(ni, except 

 that the frond is twice as wide and the margins smooth. The 

 plant has the color and consistency of Apoglossnni decipiens, but 

 differs decidedly in its method of branching (we have seen no 

 proliferations of any kind) and the position of the sori. We 

 have seen what appears to be the same form from Santa Cruz, 

 California, collected by Dr. C. L. Anderson. We refer this form 

 to Pteridium serratKiii with considerable doubt, since we have 

 been unable to examine a specimen of that species. 



Family BONNEMAISONIACE.tK. 



Bonnemaisonia hamifera Harlot. 



In the upper sublitoral zone. West coast of Whidbey Island, 

 Wash., X.L.G,, No. 2.")!, and in Collins, Holden and Hetchell, 

 P. B.-A., No. 939! 



This species varies very much in breadth and the frequency of 

 the circinate branchlets. Some specimens are as much as 6 mm. 

 broad, while others are not over 1.5 mm. even in the broadest 

 portions. The Whidbey Island specimens show cystocarps, 

 antheridia, and tetrasporangia. It is to be found fi-om May until 

 August. 



BOT.— 22. 



