150 Proceedings of the Biological Society of Washington. 



no. 63946, collected at the top of Black Mountain, Santa Cruz Moun- 

 tains, Santa Clara County, California, July 6, 1903, by W. R. Dudley. 



The following additional specimens are at hand:* 



California: West end of Loma Prieta Peak, Santa Cruz Mountains, 

 Nov. 1, 1903, Dudley (S); Mount Day in the Mount Hamilton Range, 

 Santa Clara County, altitude 1170 meters, Apr. 29, 1908, Heller; same 

 locality, " May 23," R. J. Smith (S) ; bank of Mill Creek, Ukiah, Men- 

 docino County, 1866, Bolander 4640; Hood's Peak, Sonoma County, 

 March, 1893, Michener & Bioletti. 



Nevada : Virginia City, Bloomer. 



The characters above indicated would seem sufficient for the separation 

 of this form as specifically distinct, were it not for additional specimens 

 from Hood's Peak (collected by Bioletti in 1892, and by Michener and 

 Bioletti in May, 1893), which, though lacking reduced stellate scales on 

 the upper side of the segments, seem to show in the scaly covering of the 

 under side of the lamina a transition to the broad form of scales charac- 

 teristic of true C. Covillei, in which a single large scale will completely 

 cover one or several minute segments. The distinctive scale characters 

 are doubtless correlated with conditions of habitat and climate not sur- 

 rounding the more southerly plant, but they suggest the desirability of 

 further study of this form with the help to be gained from more complete 

 material. In abundance and high color of reduced scales beneath there 

 is a considerable resemblance to C. Clevelandii, and it is otherwise evi- 

 dent that C. Clevelandii, C. Covillei, and C. Covillei intertexta are of 

 common origin. 



6. Cheilanthes Clevelandii D. C. Eaton, Bull. Torrey Club 6: 33. 1875. 

 Rhizome creeping, epigean, ligneous, relatively slender (2-3.5 mm. 

 in diameter), flexuous, with a few short branches, coarsely radicose 

 beneath, densely and persistently paleaceous, the scales imbricate, closely 

 appressed, subulate to lance-attenuate, ending in a fragile filiform tip, 

 2.5-3 mm. long, about 0.5 mm. broad, bright to dark brown, glossy, the 

 median portion moderately sclerotic or strongly so toward the apex, the 

 paler borders semitranslucent, subentire. Fronds several, erect, distich- 

 ous, 1 cm. or less apart, obliquely attached, 15-50 cm. long; stipe 7-24 

 cm. long, stout (1.2-2 mm. in diameter), light brown, often broadly 

 flexuous, thinly and deciduously paleaceous, the scales minute, very 

 slender, pale; lamina linear-lanceolate to ovate or deltoid-oblong, 

 acuminate, 7-26 cm. long, 2.5-8 cm. broad, tripinnate or nearly quadri- 

 pinnate; rachis similar to the stipe but persistently paleaceous, the scales 

 darker; pinnae numerous, mostly alternate and contiguous, ascending, 

 often strongly so, falcate, narrowly deltoid to deltoid-oblong, or the 

 lower ones sometimes exactly deltoid ; secondary and tertiary rachises 

 and the midribs of the segments copiously appressed-paleaceous beneath, 

 the scales small, imbricate, closely investing and wholly concealing the 

 segments, bright to dark castaneous at maturity, deltoid-ovate, attached 

 above the closed sinus of the deeply cordate base, abruptly long-acum- 

 inate and attenuate, conspicuously erose-dentate, the teeth long-ciliate, 

 "The specimens indicated by (S) are in the Dudley Herbarium. 



