FERNS AND FERN ALLIES 
21. Aspidium cristatum, Sw. (Crested Shield- 
fern). Quite a common fern along the borders of 
swamps and marshes, in grass. 
22. Aspidium cristatum, var. clintonianum, D. C. 
Eaton. Found quite commonly in several localities. 
At York Mills, Niagara Glen, in northern and east- 
ern Ontario in more shaded habitat than the species. 
23. Aspidium spinulosum, var. intermedium, D. C. 
Eaton. This is perhaps our most common fern, 
occurring in rich woods everywhere. 
24. Cystopteris bulbifera, Bernh. (Bladder Fern). 
One of the most common swamp ferns. It is very 
common in southern Ontario, but is rare locally 
northward. 
25. Cystopteris fragilis, Bernh. (Brittle Fern). 
Widely distributed throughout Ontario, and varied 
in form and habitat; occurring in some places on 
exposed rocks, but mostly in shade. 
26. Woodsia ilvensis, R. Br. (Rusty Woodsia). 
This is a typical northern fern, occurring on secluded 
rocks. 
27. Dicksonia punctilobula, Gray (Hay-scented 
Fern). This is also a common northern species, 
growing around rocks in the open. Occurs also in 
shaded situations near Madoc. Reported from Ingle- 
wood in rocky woods (White). 
28. Onoclea sensibilis, L. (Sensitive Fern), with 
the var. obtusilobata is very common in low, grassy 
fields and thickets throughout Ontario. 
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