134 NOTES ON POTAMOGETONS. 
The likeness to obtusifolius is remarkable, and the error may well 
be excused. It is, however, a form of P. crispus L. P. serrulatus 
unge, “Asia temp.,” I have not seen, unless it be the same as 
Regel and Maack’s plant. 
P. Casparyi F. Kohts in Oesterr. Bot. Zeit. xx. 291 (1870).— 
Is this the same as P. alpinus Balbis = P. rufescens Schrad. ? 
Richter (Pl. Europ. p. 18) makes it a full species, limited to 
Germany. ould be glad to see a specimen. 
Weyl, in Oesterr, Bot. Zeit. 1870, p. 821, says, on Dr. Ascher- 
sufficient to speak with any confidence as to its being a distinct 
species. It is evidently a departure from pusillus L. in the direction 
hardly differing from the name of the section of the genus in 
Franchet’s Flore de Loire-et-Cher, p. 638 (Enantiophyllum). It is 
greatly to be desired that paleontologists would ascertain whether 
I have from the Mauritius, by the kindness of Dr. H. H. Johnston, 
but unfortunately there are no flowers or fruit on the specimens ; 
(To be continued.) 
