1864.] LATVSON ON CANADIAN FERNS. 297 



ing spike sessile. Selaginella spimilosa, A. Braun, BIytt, Norges 

 Fl. ; Lycopodiiim selaginoides, Linn. Pursli Fl. Am. Sept, ed. ii, 

 p. G54. Selaginella spinosa, Beauv. Selaginella selaginoides, A. 

 Gray, Man. Bot. N. States, p. 605. — Gaspe, John Bell, B.A. ; 

 Canada, Michaux ; Lake Superior and northward, pretty rare, 

 Professor Asa Gray in Man. Bot. N. States ; Canada, Pursh, who 

 observes, " the American plant is smaller than the European." 



Stachygynandrum. 



S. rupestre, P. Beauv. — Much branched, leaves slightly spread- 

 ing when moist, appressed when dry, carinate, hair-tipped ; com- 

 pact and moss-like, growing on bare rocks. Selaginella rup)estriSy 

 Spring, A. Gray, Eaton. Lycopodium rup)estre, Linn., Pursh Fl. 

 Am. Sept., ed. ii, p. 654. — On the perpendicular faces of Lauren- 

 tian rocks, along the north bank of theSt. Lawrence, in Pittsburgh, 

 and on the Thousand Islands at Brockville, &c. ; Lono; Point on 

 the Gananoque River ; near Farmersville. C. W., T. F. Chamber- 

 lain, M.D.; rocks in pine groves two miles west from Prescott, 

 near the river, and on rocks west from Brockville, not common, 

 B. Billings, jun.; Bamsay, Rev. J. K. McMorine, M.A. ; Beloeil 

 and Mount Johnson, C. E., P. W. Maclagan, M.D. 



DiPLOSTACHYUM. 



D. apodum, P. Beauv. — Stems creeping, branched ; leaves pale 

 vivid green, of two kinds, — the larger spreading horizontally, 

 ovate-oblique, the smaller appressed, acuminate, stipule-like. Forms 

 compact tufts. Lycopodium apodum, Linn., Pursh. Fl. Am. 

 Sept., ed. 2. ii, p. 654. Selaginella ajnts, Gray, Eaton. — Abun- 

 dant 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, I found it sparingly but fertile, on grassy flats 

 by the river side at Odessa. Near London, . .. Saunders; Detroit 

 River, C. W., P. W. Maclagan, M.D. Apparently not common 

 in the United States. I have it from Schooley's Mountain. This 

 is a very small, compactly-growing moss-like species, well adapted 

 for cultivation under a glass shade. It was a great ftivorite with 

 the late Dr. Patrick Neill, in whose stove-house, at Canonmills, 

 Edinburgh, I first saw it many years ago. 



JVat. Ord. MARSILEACE^. 



AZOLLA. 



A. CaroUniana, Willd. — Pinnatcly branched with cellular, 

 imbricated leaves ; plant reddish, circular in outline, ^1 inch in 



