"288 Synopsis of Canadian Ferns and Filicoid Plants. 



Selaginella apus, Gray, Eaton. — Abundant on low wet ground east of 

 Front Street, Belleville, below the hill, where it was pointed out to me 

 by Mr J. Macoun, July 1863. In September 1863, 1 found it sparingly 

 but fertile, on grassy flats by the river side at Odessa. Near London, 

 W. Saunders ; Detroit River, C. W., P. W. Maclagan, M.D. Appa- 

 rently not common in the United States. I have it from Schooley's 

 Mountains. This is a very small, compactly-growing moss-like species, 

 well adapted for cultivation under a glass shade. It was a great favourite 

 with the late Dr Patrick Neill, in whose stove, at Canonmills, Edin- 

 burgh, I first saw it many years ago. 



Nat. Ord. MARSILEACE^. 



AZOLLA. 



A. Caroliniana, Willd. — Pinnately branched with cellular, imbricated 

 leaves ; plant reddish, circular in outline, -^-l inch in diameter ; leaves 

 ovate obtuse, rounded and roughened on the back (Eaton). Resembles 

 a floating moss or Jungermannia (Torrey). Gray, Man. Bot., t. 14. 

 Floating on the waters of Lake Ontario, Pursh Fl. Am. Sept., ed. 2, ii. 

 p. 672. In the adjoining states, Professor Asa Gray notices it as oc- 

 curring in pools and lakes. New York to Illinois and southward, and 

 observes that it is probably the same as A. magellanica of all South 

 America. 



Salvinia. 



[Salvinia natans = Marsilea natans, Linn. Sp. PL " Floating 

 like lemna on the surface of stagnant waters, in several of the small lakes 

 in the western parts of New York and Canada." — Pursh Fl. Am. Sept. 

 ed. 2, ii. p. 672. Professor Asa Gray states, that it has not been found 

 by any one except Pursh, and he therefore omits it from his Manual of 

 Botany of the Northern States.] 



ISOETES. 



/. lacustris, L. — Beloeil, C. E., P. W. Maclagan, M.D. ; Saskat- 

 chewan, Hook. Fl. Bor. Am. This plant is spoken of by Pursh as 

 growing in the Oswego River, near the Falls; and Professor Gray and 

 others allude to it as not rare in the New England States. It should be 

 carefully looked for in the numerous lakes and creeks of Upper Canada. 

 It grows in muddy bottoms, forming green meadows under water. Much 

 interest is attached to the genus Isoetes, since Professor Babington has 

 shown that instead of one there are many species, or at least distinct 

 races or forms, in Britain. In the United States four are known : — 

 I. lacustris, Linn. ; /. riparia, Engelm. ; /. Engelmanni, Braun ; and 

 /. fiaccida, Shuttlew., the last a southern form. Professor Babington is 

 certain of the existence of at least eight European species : — /. lacustris, 

 L. ; /. echinospora, Dur. ; /. tenuissima, Bor. ; I. adspersa, A. Br, ; 

 /. setacea, Del, ; I. velata, Bory. ; I. Hystrix, Dur. ; and /. Durice?, 

 Bory, As yet we know of only one Canadian species, which is here 

 rendered, rather uncertainly, /. lacustris. The American species are 

 described in Gray's Manual, the British ones in the new Journal of 

 Botany, London. 



