Notes on AMERICAN FERNS—XVI 3 
by Capt. John Donnell Smith, as shown by two speci- 
mens in the National Herbarium. 
PTERETIS NODULOSA (Michx.) Nieuwland. An un- 
identified specimen of this species was included in a 
collection of plants from the Queen Charlotte Islands 
recently sent to Prof. C. V. Piper, of the U. 8. Depart- 
ment of Agriculture, for examination. The label in- 
dicates that it was collected at Skidegate, by C. F. New- 
combe, in August, the year uncertain. P. nodulosa is 
usually attributed to British Columbia, but it is evi- 
dently rare in that region, and it seems worth while to 
publish a record of this specimen, a portion of which 
has been added to the National Herbarium. Since this 
species is not known to occur in Alaska, the present 
specimen appears to represent the northwestern limit 
of its range. 
PELUAEA LonaimucRoNATA Hook. Additional Color- 
ado specimens of this species are at hand from Mr. John 
P. Young, who collected them at Canyon City, August 
12, 1919. The only other Colorado material known to 
the writer is that collected at the same locality by 
Brandegee nearly fifty years ago, a specimen of this 
collection being in the D. C. Eaton Herbarium. 
Dryopreris arcuta (Kaulf.) Watt. This plant of 
the Pacific coast region, which has usually been known 
as Dryopteris rigida arguta (Kaulf.) Underw., differs 
widely from the European D. rigida and is very clearly 
entitled to the specific rank reaccorded it by Watt in 
1866.1 It is, however, frequently confused with D. 
filix-mas, not only by collectors but in the herbarium as 
ell. The firm, strongly convex indusium of D. arguta, 
with its deep, narrow sinus and glandulose margins, 
has commonly been regarded as a distinguishing char- 
acter, the indusia of D. filiz-mas ordinarily being thin, 
orbicular-reniform, and glabrous; but the marginal 
1Canad. Nat. Il. 3: 159. 1866. 
