274 THE BOTANICAL jrAGAZHiE. rvoi. xxvm. No. 333. 



? = Agardbiella tenera Collins, Phyc. Bor.-Amer. No. 1396. 

 l = Rhabdoma tenera Coll. Hold, et Setch. Phyc. Bor.-Amer. No. 

 138. 



We have at least two species of Rhabdonia on our coast, 

 in the generic conception taken by the older writers. One of 

 them which is very common about the Sagami Bay, accords 

 satisfactorily with the description of Solieria australis Harv. 

 As this form seemed in some measure applicable to other 

 species of Rhabdonia. I have had no less doubts about the 

 certainty of the identification. Studying the original specimens 

 of various species of Rhabdonia and its allies in the European 

 herbaria I was rather astonished to find them in a greatly 

 confused state. This confusion was certainly caused from the 

 fact that, in the first place, Harvey has identified various 

 different species with Solieria chordalis J. Ag. and, in the second 

 place, many of the American algologists have mixed up Rhab- 

 donia robusta J. Ag. and R. tenera J. Ag. together. The list of 

 synonymes above shown will require explanation. Before enter- 

 ing into details it should be necessary to treat first the rest of 

 the doubtful Rhabdonia species as rearranged according to my 

 own observations on the originals ;— 



Agardhiella tenera ScHMrrz. Syst. ITebcrs p. 7. 

 Rhabdonia tenera J. Ao. Spec. A]-. 354. 

 = Solieria chordalis Hakv. (Australian specimens only) 

 = Sohcria chordalis Hakv. Ner. Bor. Amer. II. ]). 121. p.p. 

 = Agardhiella tenera Coll. Hold, et Setch. Phyc. Bor. Amer. 

 No. 539. 



Agardhiella Coulteri Setch. Phyc. Bor. Amer. No. 333. excl. synon. 

 = Solieria chordalis Harv. Phyc. Austr. Synop. No. 446, (Port 



= Rhabdonia Coulteri Hakv. p.p. Ner. Bor. Amer. II, p. 154. 

 (" North West coast " specimen only) 

 Rhabdonia coccinea Harv. Aljr. Tasm. N(x 78. 



= Chrysimcnia coccinea Harv. London Journ. Bot. II, p. 448. 

 = Rhabdonia chordalis Hakv. Australian specimens p.p. 

 Harvey reported " Solieria chordalis J. Ag," to have been 

 collected on the Long Island and its vicinity as well as at 



