40 AMERICAN FERN JIURNAL. 
Both of the western forms described in my former 
article as varieties of Pellaea glabella appear to be dis- 
tinct species. One of these, P. pumila Rydb.,? has al- 
ready been described as a species. The other, my 
P. glabella var. simplex, I have determined to name P. 
Suksdorfiana,? as the most complete specimens which 
I have seen are the collections of W. N. Suksdorf (Flora 
of Washington, no. 2083) from cliffs near the Columbia 
River in Klickitat Co., Wash. My original description 
was drawn from somewhat depauperate material, and 
the diagnosis there published will have to be modified 
to include fronds up to 16 em. long, and to admit. the 
occasional compounding of the lower pinnae. 
P. glabella and the two western segregates all differ 
consistently in the shape and texture of the pinnae, 
certain details of the indusium, the texture and micro- 
scopic structure of the stipe, and the size of the spores. 
The two western species may be distinguished readily 
by the last-mentioned character, for the average length 
of the spores in any mount from material of P. Suksdorf- 
tana is 65y or more, while the average length of the 
spores in P. pumila is less than 55u. This distinction 
in size applies to both elliptical and tetrahedral spores, 
both of which have now been observed in each species. 
UNIVERSITY oF MINNESOTA. 
ot. Garden, 124. 1900. Rydberg’s alternative name, 
P. occidentalis, published in the appendix to the same work (loc. cit. p. 
466) is untenable, as it is confessedly a mere renaming of the same plant. 
It is on Elias [not Aven] Nelson’s varietal name P. atropurpurea 
occidentalis. ‘ 
*Pextaea Suksdorfiana n. sp., Peliaea glabella Mett. ex Kuhn, var 
simplex Butters, Am. Fern Journal 7: 84. 1917, 
