PELLAEA ATROPURPUREA AND P. GLABELLA 79 
part of the Black Hills of South Dakota, from which 
locality there are specimens in the Gray Herbarium.? 
Pellaea glabella, on the other hand, has a decidedly 
northern range. It is apparently more abundant and 
widespread in Vermont than P. atropurpurea. In 
tion to specimens which show that P. glabella occurs 
with P. atropurpurea near Burlington and at 
’ Pownal, there is material of the former from Pittsford 
and from Willoughby Mt., Westmore. There are no 
specimens from southern New England in either the 
Gray Herbarium or that of the New England Botanical 
Club. There is a single specimen from 
Pennsylvania, one from Erie Co., Ohio, one from Owen 
Sound, Ontario, three from Wisconsin, two from south- 
eastern Minnesota, one from Clinton, Iowa, seven from 
Missouri, chiefly from the northern half of the state, 
and two from eastern Kansas—both of the last men- 
tioned being mixed collections of the two species. There 
are no specimens of Pellaea glabella from any of the 
southern states. 
t seems probable that all references to Pellaea atro- 
Purpurea in Canada* (with the possible exception of 
southern Ontario), where it is reported to occur as far 
north as Great Bear Lake, on the Arctic Circle, refer 
either to P. glabella, or to one of its western varieties. 
n Minnesota and western Wisconsin, where I am 
Personally familiar with this fern in its living state, it 
occurs pretty widely distributed on cliffs and ledges of 
dolomitic limestone or rarely on calcareous sandstone 
La argc 
*These specimens are: Hot Springs, 3500 ft. papers haus 14, 1892, 
- Rydberg no. 1190; False Bottom Gulch, 4000 ft e, Aug. 10, 
1909, John Murdoch, Jr. no. 3573; “Black Hills Region, ga “ "1891, Wil- 
liams." The occurrence of this fern in the Black Hills, so far to the net 
Y parallel occurre 
tots Maigacn in the same region. See C. E. Bessey, Bot. Gaz. 26: 211, 
and Science, New Series, 8: 587. 
* Such as Hooker, w. J., Flora Boreali-Americana, 2: 264, 1940. Ma- 
“oun, John, Catalogue of Canadian Plants, 5: 260, 1890. 
