84 AMERICAN FERN JOURNAL 
Sourn Daxota: Bull Springs in the limestone dis- 
trict west of Custer, altitude 6000-6500 ft., July 27, 
1892, P. A. Rydberg no. 1191 (the type collection of 
Rydberg’s P. pumila, plants about 4 em. high, lower 
pinnae sometimes compound). 
Wyominc: on a perpendicular wall of limestone m 
a canyon, Laramie Hills, Albany Co., May 14, 1899, 
A, & E. Nelson, no. 6837 (this appears to be from the 
type locality of Nelson’s P. atropurpurea occidentalis, 
though it is not the type collection; it is an exceedingly 
depauperate form scarcely 3 cm. tall, and corresponds 
entirely with the original description of Nelson’s vat- 
iety); on limestone rock, Tongue River Canyon, 5000 
ft. altitude, September 5, 1900, J. G. Jack (one small 
plant very similar to those of the Rydberg collection, 
and two others, much better developed, 10-15 em. tall): — 
The second western variety of P. glabella appears t0 
be hitherto undescribed. It is 
PELLAEA GLABELLA Mett. ex Kuhn, var. simplex 
var. nov., pumila, frondibus 1-8 cm. longis pinnatls, 
pinnis 5-13 simplicibus sessilibus vel brevissime petiolatls 
lanceolatis vel ovato-lanceolatis 5-18 mm. longis 1.5-5 
mm. latis fertilibus forte revolutis; paleis rufis 0.25 mm. 
latis cellulis elongatis instructis; stipite basin versus 
paleis capillis longis instar infrequentibus pubescente. 
Like the typical form of the species in iis stron y 
coriaceous and revolute narrow leaflets, this variety 
differs in its very small size and apparently in having 
the pinnae always simple. Its scales are somewhat 
narrower than those of typical P. glabella, rather i 
caudate, about 0.25 mm. wide at the base, and compost 
of cells 10-15 times as long as they are wide. ihe ~ : 
of the stipes are sparsely pubescent, with long hair-like 
scales. The spores are nearly as in the typical i 
elliptical, and 56-77, long. : 
In the Gray Herbarium there are three specimens o. : 
this variety: | 
