535 
which is ovate-oblong in outline, not broadly triangular-ovate. Only two specimens 
(15 to 20 em. high) were collected by me, on a shaded hillside south of Custer, alti- 
tude 1,700 m., August 15. A few specimens were also collected by Prof. A. F. Woods 
and one of the students of the University of Nebraska. The specimens are of a form 
that seems to be intermediate between Ji. lunaria, B. boreale, B. lanceolatum, and 2. 
matricarivfolium., It may be anew species, but the material is too meager to warrant 
a publication (No, 1186). 
POLYPODIACES. 
Polypodium vulgare L. Sp. Pl. ii, 1085 (1753). 
Common in crevices of rocks around Custer, altitude 1,700 m., July 18 (No, 1187). 
Polypodium vulgare rotundatum Milde, Fil. Eur. & Atlan, 18 (1867). 
It differs from the preceding in its short fronds with rounded lobes and its larger, 
more confluent sori. Wheeler's Expedition, No. 992, and Watson’s No. 1357, belong 
also to this variety, which has not hitherto been reported for America. In crevices: 
Custer, altitude, 1,700 m., July 16 (No, 1188). 
Cheilanthes gracilis (Fee) Mett. Abh. Senck. Nat. Gesell. iii [reprint 36] (1859); 
Myriopteris gracilis Fee, Gen. Fil. 150 (1850-1852). 
On exposed rocks: Hot Springs, altitude, 1,100 m., June 14 (No, 1189). 
Pella atropurpurea (L..) Link, Fil. Hort. Berol.59 (1841); Pteris atropurpurea L. 
Sp. Pl. ii, 1076 (1753). 
Canyon near Hot Springs, altitude 1,100 m., June If (No. 1190), 
Pellzea breweri Eaton, Proc. Amer. Acad. vi, 555 (1865). 
The specimens in this collection have fronds that are decidedly coriaceous, a modi- 
fication probably due to the exposed locality in which they grew. I took them first 
to be a depauperate form of P. atropurpurea, but the divisions even of the fertile 
fronds are broadly ovate, the rachis bright brown instead of purplish black and 
without scales. They are brittle and when old show the depressions that make them 
look as if articulated, a characteristic of P. breweri, The fronds are 0.5 to 1 dm 
high from a tufted, thick rootstock, once pinnate, of 5 to 9 pinnw ; pinne, 1 em. or 
more long, oval or ovate, entire, or the lower with asmall lobe on the upper side, 
In crevices of exposed limestone rocks, generally on the sunniest side: near Bull 
Springs, altitude 1,900 m., July 27 (No, 1191). 
Pteris aquilina L. Sp. Pl. ii, 1075 (1753). 
Custer, altitude 1,700 m., August 19 (No, 1192). 
eo 
Asplenium trichomanes I.. Sp. Pl. i1, 1080 (1753). 
Crevices of rocks below Sylvan Lake, altitude 1,900 m., August 18 (No, 1193). 
Asplenium septentrionale (L.) Hofim. Deutsch, Fl. ii, 12 (1795); Acrostichum 
septentrionale L. Sp. P1, il, 1068 (17538). 
Crevices of rocks, especially on the north side of the mountains: Custer, altitude 
1,700 m., June 5 and August 16 (No, 1194). 
Asplenium filix-foemina (L.) Bernh. Schrad. Neues Journ, Bot. i, pt. 2, 26 (1806) ; 
Polypodium filix-famina L, Sp. Pl. ii, L090 (1753). 
Common around Sylvan Lake, altitude 2,000 m., July 20 (No, 1195), 
Phegopteris dryopteris (L.) Fee, Gen. Fil. 243 (1850-1852); Polypodiun dryopleris 
L. Sp. Pl. ii, 1093 (1753). 
In dark woods near Custer, altitude 1,700 m., August 19 (No. 1196). 
Dryopteris filix-mas (L.) Schott, Gen. Fil. (1881); Polypodium filix-mas L. Sp. 
Pl. ii, 1091 (1753). 
Among rocks: Roehford, altitude 1,200 m., July 12; Buekhorn Mountain, near 
Custer, altitude 1,800 m., July 16 (No. 1197). 
