A Monograph of the Genus Alaria. 95 



speaking, the striation runs obliquely ascending from the midrib 

 towards the blade margins, without relation to the pinnate cleav- 

 ing. They are coarse at first, counting 10-12 streaks in 1 cm. in 

 the dried specimens. The streaks ramify towards the blade margins 

 so as finally to number 16-20 in 1 cm. The streaks are not con- 

 tirmous lines but are composed of small dots. These dots are also 

 at regular intervals. Hence another striation results, though much 

 more irregular, intersecting with the first one. The general ap- 

 pearance of such a portion of the blade may be roughly compared 

 with the curved lines engraved on a watch-case by a rose-engine, 

 or with finely shagreened leather. 



Rjmarhs on the synonyms. The present writer actually observ- 

 ed and collected A. cordata Tilden at the type locality with the 

 establisher of the species herself. So he may be permitted to say 

 that his knowledge of the species is sufficient to distinguish it 

 from the allied forms. On studying the type of A. marginata P. 

 et R. in the herbarium of the Academy of Sciences of Petrograd, 

 he w^as at once certain that both were one and the same species. 

 Setchell and Gardner i) remark that " as far as the incomplete 

 description goes, A. marginata P. et R. seems to resemble A. 

 laticosta Kjellm." They further note that A. cordata Tilden seems 

 to have no character to separate it from A. Pglail Grev. Tliis 

 undoubtedly resulted from either their unsatisfactory acquaintance 

 with a complete specimen of Miss Tilden's, or otherwise the non- 

 uniformity of the specimens in lier exsiccata?. 



Harvey 2) reported the occurrence of this species about Fuca 

 Strait adjacent to Vancouver Island. Curious to say, the specimens 

 kept under this species in the herbarium of Trinity College, 



1) Setchell and Gardner : Algae of N. W. Coast of N. Amer., p. 275. 



2) Harvey : Notices of a Collection of Algae, etc., p. 165. 



