362 Eaton: ISOETES RIPARIA CANADENSIS AND I. DODGEI 
appearance may be had save by considerable manipulation, are 
characteristic of 7. Canadensis. Fuller descriptions may be had 
by reference to the description of /. Dodget (Fern. Bull. 6: 5. 
1898). I can find no difference between these and the submersed 
form of the Kingston (N. H.) plants. 
With material at hand from so many localities it is a matter of 
no little surprise that Engelmann and Braun did not recognize 
their identity and specific value. 
The species becomes I. Canadensis, with the following syn- 
onymy : 
Isoetes Canadensis (Engelm.) A. Br. Mss. 
I. riparia Canadensis Engelm. Trans. Acad. Sci. St. Louis 4: 
383. 1882. 
I. Dodget A. A. Eaton, Fern Bull. 6: 5. 1898; Fernwort 
Papers, 15. 1900. 
I. lacustris Moser, in herb. 1832. Not L. 
I, Canadensis A. Br., in letter to Engelm., 3 Ap 1867. 
I. paupercula A. Br., in letter to Engelm., 3 Ap 1867. Not 
!. lacustris paupercula Fngelm. Trans. Acad. Sci. St. Louis, 4: 
a7 F. :1882. 
I. Engelmanni Engelm. in part. Not A. Br. 
I. riparia Engelm. in part. 
It has been seen from the following localities: British Colum- 
bia: Vancouver Island, Macoun, Ontario ; Crow River, near Belle- 
ville, Macoun. Maine: Cornish, Chickering ; Kennebunk (coll. ?); 
Peasepond, East Wilton, Fernald. New Hampshire: Kingston, 
A, A. Eaton ; *‘ Opposite Brattleboro, Vt.,” Frost. Massachusetts : 
Paul’s Bridge, Dedham, C. £. Faxon. Pennsylvania: Point Pleas- 
ant, Best; Bethlehem, Durand, Rau, Moser ; Mouth of Tucquan 
(Lancaster Co.), no collector given, and determination rests on 
androspores alone (specimen in U. S. Nat. Herb.). _ 
The emersed form, with intricately snarled leaves, is unique 
and well deserving varietal rank. This being the form from which 
most of my characters of /. Dodgei were drawn, it may well bear 
the name of I, Canadensis Dodgei. It has not been seen from 
any other locality than Kingston, N. H,. 
