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Mackenzie, of New York, and Professor A. B. Hitchcock, of the United 
States Department of Agriculture, who have checked over, respectively, the 
1926-27 collections of Carex and the Gramineae; to Mr. C. A. Weatherby, 
of Gray Herbarium, who has checked all of the ferns and fern allies; and 
to Dr. I. M. Johnston, of the Arnold Arboretum, who has verified the deter- 
minations of the few specimens of Boraginaceae. 
OPHIOGLOSSACEAE 
Botryehium Lunar; n (L.) Sw. Moonwort. 
Occasional in upland aspen woods and in small prairie openings. Young 
shoots were found in Pine Lake district June 22, immature sporangia 
July 3, and fruiting plants July 9. 
Pine Lake district, No. 1452. 
POLYPODIACEAE 
Woodsia ilvensis (L.) R.Br. It U STY Woodsia. 
Common in crevices on granite hills in the Athabaska-Peace delta and 
along upper Slave river. Found in fruit July 9 and August 15. 
Along Quatre Fourohes river, No. 8; Government Hay Camp, Slave 
river, No. 1450. 
W. oregana D.C. Eat. 
Apparently a rare fern in the region. Found thus far only in a moist 
ravine on a granite hill in the Athabaska-Peace delta. 
East shore of lake Mamawi, No. 1453- a. 
Cystopteris fragilis (L.) Bernh. Filix fragilis (L.) Cilrb. Brttle Fern. 
Common in shaded rock crevices, reaching greatest size and abundance 
in moist ravines. Found fruiting July 19 and August 8. 
Limestone sink-hole at Peace point, No. 1454; east shore of lake 
Mamawi, No. 1453. 
Pteretis nodulosa (Michx.) Nieuw. Onoclea Struthiopteris Am. auth., not Hoffm. 
Matteuccia Struthiopteris Am. auth., not Todaro. See Rhod. xvii, 164 (1915), 
Ostrich Fern. 
Common in woods along lower Athabaska river, but not found elsewhere 
in Wood Buffalo park. Collected thus far only in sterile condition. 
Reed portage, upper Embarras river, No. 1448. 
Cryptogramma crispa (L.) R.Br., var. acrostichoides (R.Rr.) C. B. Clarke. C. 
acrostichoides R J3r. Parsley Fern. 
Common in crevices on the granite hills along upper Slave river. Fruit- 
ing abundantly in August. 
Government Hay Camp district, Slave river, No. 1451. 
Polypodium virginianum L. See Rhod. xxiv, 125 (1922), Common Polypody. 
Common in crevices on granite hills in the Athabaska-Peace delta 
and along upper Slave river. Found in fruit June 9 to August 16. 
East shore of lake Mamawi, No. 1456; along Quatre Fourches river, 
No. 10; Government Hay Camp district, Slave river, No. 1455. 
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