An Annotated List of the Pteridophytes of North- 
western Ontario 
O. E. JENNINGS 
During the summers of 1916 and 1917 my wife and I 
continued our botanical work in northwestern Ontario. 
We have now spent the major part of five summers in 
this region, articles having been published in the AmMErR- 
ICAN FERN JOURNAL on the itinerary and pteridophytes 
collected in 1912, 1913, and 1914. See literature cited 
at the end of this article (6), (7). 
It has been thought best to assemble the various col- 
lections as well as possible this year, as the amount of 
material secured on these various trips and the number 
of localities visited will enable us to publish a fairly 
comprehensive and complete list of the flora of a con- 
siderable part of Ontario lying to the north and north- 
west of Lake Superior. During 1916 we went again to 
Sioux Lookout, about two hundred miles northwest of 
Lake Superior, remaining there over a month and work- 
ing that region over quite thoroughly. In 1917 we spent 
the first half of the summer along the line of the Canad- 
ian Northern Railway, east of Lake Nipigon, stopping 
first at Longuelac, a station at the north end of Long 
Lake, and distant about seventy-five miles east of Lake 
Nipigon and an equal distance north of Lake Superior. 
This region is one of little relief, there being much 
Spruce muskeg from which rise the low rounded hills 
and rolling lands of rounded rocks and glacial soils. 
The second stop of 1917 was at Jellicoe, about half 
way between Longuelae and Lake Nipigon, approx! 
mately on the divide between the Hudson Bay and the 
Lake Nipigon drainage; the region being one with ex- 
tensive sand-plains (glacial terraces) from which mse 
tounded rocky hills of considerable size and into which 
the Blackwater River has excavated a deep and often 
lake-like channel. There are also numerous smaller 
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