NO. 8 FERNS FROM SOUTH AMERICA MAXON 5 



lamina and to consist of the copiously filamentose extremities of the 

 widely imbricate scales just described. Aside from this derived 

 covering- the upper surface of the segments is glabrous, no scales or 

 hairs whatever arising from it. 



CHEILANTHES INCARUM Maxon, sp. nov. 



Rhizome decumbent, woody, about 2 cm. in diameter each way, 

 very coarsely radicose beneath, densely paleaceous above, the scales 

 flaccid but erect and closely tufted, light castaneous, 10 to 15 mm. 

 long, 0.25 to 0.35 mm. broad, linear-ligulate, long-attenuate (the 

 cells linear to narrowly oblong, indistinct, acutish or mostly obtuse), 

 sharply flexuous toward the apex, here provided with numerous 

 large, curved, elongate, mainly retrorse teeth, similar but smaller 

 teeth borne upon the margins sparingly throughout. Fronds numer- 

 ous, cespitose, erect, arcuate, 12 to 18 cm. long, densely paleaceous 

 beneath ; stipes 4 to 6 cm. long, 1 to 1.3 mm. in diameter, dull reddish 

 brown beneath a persistent paleaceous covering like that of the 

 lamina beneath ; lamina narrowly lanceolate-elliptic, 9 to 12 cm. long, 

 1.8 to 2.8 cm. broad, attenuate at the apex, slightly narrowed at the 

 base, bipinnate; pinnse 13 to 18 pairs, sessile, the lowermost 2 or 3 

 pairs distant, the others adjacent but scarcely imbricate, the larger 

 ones 1 to 1.6 cm. long, 5 to 7 mm. broad, elongate-deltoid, inequi- 

 lateral, obtuse or acutish, broadly ascending, strongly involute, the 

 lower surface wholly obscured by a dense covering of large, broadly 

 imbricate, whitish or yellowish brown, nearly concolorous, deltoid- 

 ovate, denticulate-ciliate scales, the acuminate tips of many of these 

 recurved upon the upper side of the otherwise glabrous pinnse; 

 pinnules of the larger pinnae 4 or 5 pairs, spreading, the larger ones 

 pinnately divided with 1 or 2 pairs of sessile or semiadnate, roundish 

 segments, the others crenately lobed, or the apical ones simple; 

 segments not lobed, slightly revolute, the f ew-sporangiate sori termi- 

 nal upon the veins at the slightly modified margin; sporangia 

 glabrous ; spores triplanate, closely tuberculate. 



Type in the U. S. National Herbarium, no. 761644, collected near 

 Cuzco, Peru, altitude 3,300 meters, September 1, 1914, by Dr. and 

 Mrs. J. N. Rose (no. 19061) . 



Related to C. ornatissima, from which it differs in its less dissected 

 lamina, more distant pinna?, and less widely revolute segments, and in 

 the character of its paleaceous covering. The scales of the under 

 surface are deeply denticulate-ciliate but not at all filamentose, the 

 upper side of the lamina being only partially covered by the slender 



