535 



■wliicli is ovate-obloug iu outliue, not broadly triaugnlar-ovute. Ouly two specimens 

 (15 to 20 cm. bigli) Avere collected by me, on a shaded hillside south of Custer, alti- 

 tude 1,700 nu, 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 iuteiiuediate between J'>. hiuariii, 11. horeulc, 11. lanceulatum, and /»'. 

 matricana/olium. It may be a new species, but the material is too meager to warrant 

 a publication (No. 1186). 



POLYPODIACEiE. 



Polypodiuni vulgare L. Sp. PI. ii, 1085 (1753). 



Common iu crevices of rocks around Custer, altitude 1,700 m., July 18 (No. 1187). 



Polypodiuni vulgare rotundatum Milde, Fil. Eur. &, Atlan. 18 (1867). 



It dirt'ersfrom the jireccHling in its short fronds with rounded lobes and its larger, 

 more confluent sori. Wheelers 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). 



Cheilauthes gracilis (Fee) Mett. Abh. Senck. Nat. Gesell. iii [reprint 36j (1859); 

 Myriopteris gracilis Fee, Gen. Fil. 150 (1850-1852). 

 On exjwsed rocks: Hot Springs, altitude, 1,100 m., Juno 14 (No. 1189). 



Pellaea atropurpurea (L.) Link, Fil. Hort. Berol. 59 (1811) ; Ptcris atroinirpurea L. 

 Sp. PI. ii, 1076 (1753). 

 Canyon near Hot Springs, altitude 1,100 m., June 14 (No. 1190). 



Pellaea breweri Eaton, Proc. Amer. Acad, vi, 555 (1865). 



The specimens in this collection have fronds that are decidedly coriaceous, a modi- 

 fication iirobably duo 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. hreweri. The fronds are 0.5 to 1 dm 

 high from a tufted, thick rootstock, once pinnate, of 5 to 9 pinna- ; pinua>, 1 cm. or 

 more long, oval or ovate, entire, or the lower witli a small 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 aquihna L. Sp. PL ii, 1075 (1753). 

 Custer, altitude 1,700 m., August 19 (No. 1192). 



Asplenium trichomanes L. Sp. PI. ii, 1080 (17.53). 



Crevices of rocks below Sylvan Lake, altitude 1,900 m., August 18 (No. 1193). 



Asplenium septentrionale (L.) Holi'ni. Deutsch. Vl. ii, 12 (1795); Jcrosliclium 

 stptentrionuh L. Sp. PI. ii, 1068 (1753). 



Crevices of rocks, esi)ecially on the north side of the mountains: Custer, altitude 

 1,700 m., June 5 and August 16 (No. 1194). 



Asplenium filiz-fcemina (L.) Bernh. Schrad. Nenes .Journ. Bot. i, pt. 2, 26 (1806); 

 roli/podiutn fdix-fwmina L. Sp. PI. ii, 1090 (17.53). 

 Conunon around Sylvan Lake, altitude 2,000 m., July 20 (No. 1195). 



Phegopteris dryopteris (L.) Fee, Gen. Fil. 243 (1850-1852); Polypodiuu dnjuplcria 

 L. Sp. P]. ii, 1093 (1753). 



In dark woods near Custer, altitude 1,700 m., August 19 (No. 1196). 



Dryopteris filix-mas (L.) Schott, Gen. Fil. (1834); Poly podium JiUx-mas L. Sp. 

 PI. ii, 1091 (1753). 



Among rocks: Kochford, altitude 1,200 m., .luly 12; Buckhorn Mountain, near 

 Custer, altitude 1,800 m., July 16 (No. 1197). 



