181 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



[Vol. 9 



lehem, August, 1882, Rau ( Mo. Bot, Gard. Herb.); 



gravelly banks, tidal margin of the Delaware, opposite 

 Chester, August, 1894, Palmer (Mo. Bot. Gard. Herb.); 

 shores of Delaware, opposite Chester, 22 August, 1896, with- 

 out collector (U. S. Nat. Herb.); shores of Delaware, op- 

 posite Chester, 1 August, 1896, Palmer (Mo. Bot. Gard. 

 Herb.). 



48a. Var. canadensis Engelm. Trans. St. Louis Acad. Sci. 4: 

 383. 1884. 



/. Dodgei Eaton, Fern Bull. 6: 6. 1898. 



/. Dodgei var. Robbinsii Eaton, Rhodora 10: 42. 1908. 



/. canadensis Eaton, Proc. U. S. Nat. Mus. 23: 650. 1901; 

 Bull. Torr. Bot. Club 30: 359-302. 1903. 



/. canadensis var. Robbinsii Eaton, Rhodora 5 : 7. 1903. 



Usually larger than the species; leaves 15-75, 10-45 cm. long, 

 with rather prominent membranaceous margins; stomata nu- 

 merous; peripheral strands variable (2-4) or lacking; ligule cor- 

 date lit base, subulate; sporangia 5-8 mm. long, partly covered 

 by velum (V4-Mi); megaspores white, 440-650 u in diameter, 

 with usually scattered, thin, spiny crests, brief and discontinu- 

 ous, though sometimes anastomosing, particularly on the basal 



face; microspores 27-37 u long, minutely roughened to decidedly 

 spinulose. 



Distribution: eastern Canada, Massachusetts, Connecticut. 

 Specimens examined: 



Canada: IVtites Chaudieres, near Ottawa, emersed, 11 August, 



1917, Bro. Rolland 6230 (Mo. Bot. Gard. Herb, and N. Y. 

 Bot. Gard. Herb.); Brigham's Creek, Hull, 29 August, 1894, 

 Macoun 1J#18 (Gray Herb.); near Hull, 4 October, 1907, 

 Macoun 76921 (Gray Herb, and N. Y. Bot. Gard. Herb.); 

 Ottawa River below railway bridge, Hull, 18 August, 1911, 

 Macoun 84084 (Gray Herb, and N. Y. Bot. Gard. Herb.); 

 mud in places that had been overflowed in spring, Hull, Oc- 

 tober, 1890, Macoun (N. Y. Bot, Gard. Herb.). 



New Hampshire: Kingston, 26 July, 1896, Eaton 351 (Mo. Bot. 



Gard. Herb.) ; Kingston, 28 July, 1896, Eaton 362 (Mo. Bot. 

 Gard. Herb.) ; East Kingston, 9 September, 1897, Eaton 900 

 o. Bot. Gard. Herb.); flats of Powow River, Trickling 

 Falls, Kingston, 23 July, 1896, Eaton (Mo. Bot. Gard. 



