vol.i] SetcJiell— Gardner. — Alga> of Xortluvestern America. 279 



Alaria valida f . longipes Setchell and Gardner f. nov. 



Stipe long, S-20 em. in length, not including any of the 

 rhaehis. Otherwise as in the type. 



With the typical form on the west coast of Whidbey Island, 

 Wash.. X.L.G., No. 111! 



A few specimens from the west coast of Whidbey Island, 

 growing on the same rocks with the typical form, show such 

 pronouncedly longer stipes from the majority of the specimens 

 that it seems necessary to call attention to them under a separate 

 form name. 



Family DICTYOTACE^. 



Dilophus flabellatus Collins. 



Washed ashore. Sackmau's Point, near Traeyton, Kitsap 

 County. Wash.. Tilden, No. 335!, under Dictyota dichotomaf. 

 latifolia. 



Tins has been compared with the plant of Collins (in Collins, 

 Holden and Setchell, P. B.A., No. 834, 1901) both by Collins, 

 and ourselves. Tt seems to certainly be the same. It, as well as 

 the cotype cited, does not show the Diloplms- structure in all 

 parts and it may be doubted as to whether Dilophus is really dis- 

 tinct from Dictyota and also as to whether I), flabellatus is really 

 distinct from Dictyota Binghamice of J. G. Agardh. It seems 

 distinct, but farther study and comparison is needed. However, 

 it is a strange matter of distribution to find a plant, hitherto . 

 known only from Southern California and distinctly subtropical, 

 in this northern locality. It may be that there will be found 

 other warm water species in the inland and shallower portions of 

 Puget Sound. Miss Tilden has kindly informed me that, in her 

 opinion, this plant must have grown near the place where it was 

 found, "for it came up in large quantities and at all times on the 

 incoming tide". The only other collection of this species, north 

 of Santa Barbara, California, known to us, was made by one of 

 us at Monterey, California, near the steamboat wharf, shortly 

 after the arrival of a steamer from Southern California. 



