26 ART. 12. — K. YENDO. 



In the Minnesota Botanical Studies, Ser. III. Part 1, Holtz 

 describes a plant under the name Pelvetia fasUgiata, collected 

 at the Seaside Station. The illustration of its habit (PL VII.) 

 proves it to be of the sanae species as the plant that I collected 

 there. Tlie photograph of an isolated plant, though differing 

 slightly from the Californian forms, shows the characters of 

 Pelvetia fastigiata. It is somewhat broader than the high tide 

 forms of Pelvetia Wrightii f. typica. The oogonia studied by 

 Holtz prove the plant to belong to Pelvetia ; and when I 

 examined the receptacles of the fresh material of the Canadian 

 form at the Station I also clearly observed the two parted 

 oogonia. There can be no doubt that the plant described by 

 Holtz is of the same species as that which I have compared 

 to a high tide form of our /. typica ; and that it is a form, if 

 not the type, of Pelvetia fastigiata. 



On the other hand, there is some similarity between the 

 sterile specimens of Fucus furcatus f. distichus and the Canadian 

 form — the reason, probably, why Haevey thouglit the plant 

 might be Fucus furcatus. 



Summing up the above considerations I may conclude that 

 there are close relationships between Pelvetia Wrightii, (especially 

 /. typica) and Pelvetia fastigiata: that these are distinguishable 

 from each other in their low tide forms only : that the sterile 

 specimens of the two species found above the high water marks 

 are scarcely distinguishable : and lastly that Fucus furcatus f 

 distichus has some external resemblance to the dwarfed forms 

 of these two species. 



Localities : /. tyjnca ; Matsushima, Rikuzen Prov. (Oka- 

 muea); Kesennuma, Rikuchil Prov. (Oi^àmura) ; Shimofuro (!), 

 Shiranuka (I), Mutsu Prov.; Hakodate (!) (Wright, Harvey) 



