and the European Maliaverniana. Leaves 25-200, as much as 6ocm. 

 in length in water, about io-i5cm. when growing on banks. Known 

 at once in the field by its size, but especially by the sporangium, 

 which is light brown in color ( white in nearly all other New Eng- 

 land species), and is sparsely rilled with very small spores. Mic- 

 rosporangia are rarely found in this species, but as it is abundant in 

 several localities, it certainly must bear microspores, as it never 

 multiplies by offshoots. It may be possible, but not probable, that 

 some sporanges bear both kinds of spores. I have noted such 

 sporanges in Tuckermani and several other species, but the micro- 

 spores are usually aborted in such cases. 



Found thus far only in the waters of three small rivers Powow 

 at East Kingston and Kingston, N. H., and Amesbury, Mass., 

 in the Lamprey at Epping and Newmarket, A. A. Eaton; in Parker 

 river at Georgetown, Mass., Dodge. 



10. I. Gravesii n. sp. 



Plant dioecious or polygamous, rather large : rootstock bi- 

 lobed : leaves 50-75, 12-15011. long, imm. in diameter in the mid- 

 dle, erect, sharp pointed, dark green, with abundant stomata and 

 four bast-bundles : velum quite narrow, inner sporanges oval, light 

 cinnamon in color from the abundance of vermiform, translucent, 

 light-colored sclerenchym cells ; macrospores many, small, 351-405 n 

 in diameter, tetrahedro-globose, the upper facies flat, densely cov- 

 ered with short, truncate, mostly single columns ; microspores not 

 seen. 



Goshen, Conn., Underwood, 1899; gravelley tidal shore, Sel- 

 dens Cove, Lyme, Conn., August 31, 1900, Dr. C. B. Graves. 

 Specimens were sent to Dodge from this locality by Graves in 1895. 

 It was at first referred to Eatoni, but was finally separated, and has 

 since lain without name. It has the aspect of sac charata; \s\\\. its 

 affinities are with Eatoni, with which it agrees in being polygamous, 

 in appearance of sporangium and shape of spores, which in both 

 have the appearance of being abortive. It is a smaller plant with 

 erect leaves, while the emersed ones of Eatoni are not. The spore 

 sculpture, resembling echinospora rather than Eatoni, safely sepa- 

 rates them. Though the majority of the columns are single, each 

 spore usually has a few connected into vermiform or horseshoe- 

 shaped figures, but they are walls rather than wrinkles, and in this 

 respect resemble Eatoni but remotely. 



The type is in my private herbarium ; co-types are deposited 



