496 CONTRIBUTIONS ETBOM Mil. NATIONAL SEBBABIUM. 



plnns 12 t«» ii pairs, the lowermost Dearly or quite opposite and distant, 

 middle ones orate, approximate and mostly alternate, apei of the frond short; 

 pinna rery unequally and broadly triangular, 11 to 18 cm. long; B to 8 

 cm. broad al base, 1 1 1 « - urst Inferior pinnule 1 to 1.5 cm. long and 2 to •"'. cm. 

 distant from the main rachls, the first superior pinnule 1..". to l* cm. l « • 1 1 -_r and 

 1.75 cm. <ii<tant from the main rachls; pinnules triangular-ovate, those 

 of the lowermost pairs of pinna relatively narrower with • '• t<» !» pair 

 approximate narrowly ovate plnnula and a subentlre acute terminal segment, 

 only the .*; or \ larger pairs of plnnula of the lower pinnules again plnnatlfld 

 Into small ovate segments; under surface glabrate, with a few yellowish hairs; 

 sort confluent, continuous or occasionally Interrupted by a shallow Inden- 

 tation; indusia narrow, membranous 



Type in the r. s. National Herbarium, no. 572224, this being one of several 

 sheets of Dr. Edward Palmer's no. 187, collected at Victoria, State of Tamaull- 



tfexico, in a river canyon, under overhanging rocks, altitude about 

 meters, February 1 to April «.». 1907. Doctor Palmer's no. 563 and no. 564 W ith 



identical data are the same. X°OUng seinifertile or sterile plants differ in having 



the fronds almost termite or Bubpentagonal, ami the final segments obti 

 even rounded: in the last particular considerable variation is to be note. 1 . 



in mature specimens. 



CheiUmthes aemula is allied to C. microphylla, with which indeed it grew at 

 the type locality: hut from that species it differs notably in its broadly triangu- 

 lar fronds and far greater subdivision. 



Additional specimens to he referred here are. as represented In the National 

 Herbarium, Dr. <'. <;. Pringle's r-' s ^ (distributed as r. microphylla) , from 

 shaded banks near Monterey. State of Nuevo Leon. .Mexico. June 20, 1 ssv > : and 



Doctor Palmer's no. in:; of his 1^1 collection from some part of Goahuila 



or Nuevo Leon. 



Cheilanthes peninsularis Maxon, Bp. nov. 



Plant 1." to 17 cm. high, the fronds home closely: rhizome short-creeping. 

 branching, with compact covering of minute acicular brownish-striped scales, 

 those of the growing point tawny and long-attenuate ; stipe 7 to 10 cm. long, 

 very slender (about 5 mm. in diameter), dark purplish brown, sparsely cov- 

 ered with very Blender (mostly filiform) tortuose shrunken yellowish brown 

 scales, mostly appressed and inconspicuous: lamina •', to 8.5 cm. long, \ to .". em. 

 broad, narrowly ovate, clear bright green, deeply tripinnatifid, membranaceous; 

 primary and secondary rachises bearing chaff similar in texture and color to 

 that of the stipe hut mostly broader, especially that <»f the secondary rachls 

 which is linear-lanceolate, attenuate, tapering from the base, more or less 

 erose; pinna about 6 pairs, the lowermost Bubopposite, with lower basal pin- 

 nules somewhat produced. :; to :;.7 cm. Ion- BUbtriangular-OVate, 2 to L\." cm. 

 distant from the next pair above, these oblong-ovate; the remaining pinna 

 spaced, not overlapping, alternate: in general, tic larger pinna deeply bi- 

 pinnatilid. with about •'» pairs of spaced alternate oblong-ovate pinnules, these 



obliquely and deeply divided into 1 or 5 pairs of alternate Ligulate-cuneate 

 lobes connected by a flexuose wing of nearly equal width, the larger lobes again 

 once or several times cleft toward the apex: sorl terminal on the solitary 

 veins of the ultimate lobes; indusia formed by the slightly modified intlexed 



margins. 

 Type in tin- U. s. National Herbarium, wo. 397t »i-_\ collected by T. s. Bran- 

 in the cape region of Lower California, Mexico. November, 1902. There 



are in addition two >h.'.-i> from San .lose del Cabo, that is p. say. the same 



region, also collected by Mr. Brandegee, September 10, L890. ah were dls- 



