CATALOGUE. 319 
Pellza Breweri, D. ©. Eaton. 
Rootstock ascending, short, covered, like the bases of the densely 
tufted shining-brown very fragile stalks, with abundant narrow crisped 
fulvous chaff; fronds 2-6 inches high, simply pinnate, the pinnz short- 
stalked, 6-8 pairs, membranaceous, mostly 2-parted, the upper segment 
larger; segments and upper pinnz oblong-ovate, rather obtuse, in the fer- 
tile fronds narrower ; involucre continuous, pale; veins repeatedly forked.— 
Proceedings of Amer. Acad. vi, p. 555; Botany of U.S. Geol. Expl. of 
40th Parallel, p. 395, t. xxxx. 
Common on exposed rocks in the higher cafions of the Sierra of California (Brewer, Bolander, 
No. 6243), and eastward to the Wahsatch, 7-9,000 feet altitude, Watson, Eaton. New Mexico (Dr. Loew 
in Lieut. Wheeler’s Expl.), and near Loma in Southern Colorado, Dr. Rothrock, Stalks half a line thick, 
terete, very fragile, so that in dried specimens the fronds are commonly broken off. The chaff is very 
abundant, bright cinnamon-brown, and composed of exceedingly narrow linear scales, 3-4 lines long. 
The scanty specimens from Loma, near the headwaters of the Rio Grande, show one or two additional 
segmerts of the lower pinnx, but the Californian plants have the lower 3-5 pairs of pinn® unequally 
2-parted, the uppermost 2-3 pairs entire. The nearest related species is P. auriculata of South Africa. 
Pellwa gracilis, Hooker, Sp. Fil. ii, p. 138, t. 133, B; Gray’s Manual, ed. 
5, p. 660. Pteris gracilis, Michaux. Allosorus gracilis, Presl. A. crispus, var, Stelleri, 
Milde, Fil. Europe et Atlantidis, p. 26. Pteris Stelleri, Gmelin. 
Usually in clefts of damp and shaded Limerock cliffs. Ten-mile Cation, near Breckinridge City, 
Colorado, Brandegee. Labrador to Pennsylvania and Wisconsin ; also in Mantchooria, Siberia, Tibet, and 
the Himalayas. 
§ 2. ALLOSORUS. Baker. 
Texture coriaceous, the veins not evident, involucre conspicuous. 
* Pinnules or segments obtuse or barely acute, not apiculate. 
+ Frond pinnate or bipinnate, never thrice pinnate. 
 Pelilwa atropurpurea, Link—Hooker, Sp. Fil. ii, p. 138; Gray’s Manual, 
ed. 5, p. 660. 3 
- Rio Mimbres, New Mexico (Dr. Bigelow), and Arizona, Dr. Parry. From Vermont and Canada to 
the Rocky Mountains of British America, and southward to Tennessee and Indian Territory. It reappears 
in Chiapas, and Fée’s P. mucronata from the Valley of Mexico is not distinguishable from common forms. 
The plant varies much in the form and number of its segments, and in having the stalk and rachis per- 
fectly smooth (P. glabella, Mett. & Kubn, in Linnea, vol. 36, p. 87), or more or less rusty-puberulent. 
Pellza aspera, Baker. 
Rootstock short, ascending, moderately chaffy with narrow scales ; 
stalks slender, 2-3 inches long, black, but with a pale scurfy pubescence ; 
frond oblong-lanceolate, 4-6 inches long, bipinnate ; pinne and pinnules 
