CATALOGUE. 319 



Pellsea Breweri, D. C. 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 pinnse short- 

 stalked, 6-8 pairs, membranaceous, mostly 2-parted, the upper segment 

 larger ; segments and upper pinnse 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 canons of the Sierra of California (Brewer, Bolander, 

 No. 6243), and eastward to the Wahsatch, 7-9,000 feet altitude, Watson, Eaton. New Mexico (Dr. Lome 

 in Lieut. Wheeler's Expl.), and near Loma in Southern Colorado, Dr. Molkroek. 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 Eio Grande, show one or two additional 

 segments of the lower pinnse, but the Californian plants have the lower 3-5 pairs of pinna) unequally 

 2-parted, the uppermost 2-3 pairs entire. The nearest related species is P. auriculata of South Africa. 



Pellsea gracilis, Hooker, Sp. Fil. ii, p. 138, t. 133, B ; Gray's Manual, ed. 

 5, p. 660. Pteris gracilis, Micliaux. Allosorus gracilis, Presl. A. crispus, var. Stelleri, 

 Milde, Fil. Europse et Atlantidis, p. 26. Pteris Stelleri, Gmelin. 



Usually in clefts of damp and shaded Limerock cLffs. Ten-mile Cafion, 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. 



Pellaea atropurpurea, Link. — Hooker, Sp. Fil. ii, p. 138 ; Gray's Manual, 

 ed. 5, p. 660. 



Eio Mimbres, New Mexico (Dr. Bigelow), and Arizona, Dr. Parry. From Vermont and Canada to 

 the Eocky Mountains of British America, and southward to Tennessee and Indian Territory. It reappears 

 in Chiapas, and Fee'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. & Kuhn, in Linnsea, vol. 36, p. 87), or more or less rusty-pnberulent. 



Pellaea 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 ; pinnse and pinnules 



