374 51. MONOGKAMME. 



Hab. California and New Mexico along the Andes.— We include here four species of 

 Mettenius. His C. Bordgitma, Eeich., has the pinnse very close, and the lower pair much 

 larger than the others, with the powder bright-yellow. From this C. cretacea seems_ to 

 differ only by its white powder, and there are various intermediate stages. In 0. camdida 

 and monosticha the pinnse are not so close and less unequal, the powder being white in the 

 first and yellowish in the latter. 



23. N. (Cine.) flavens, Moore ; st. densely tufted, 4-8 in. 1., glossy, naked, 

 chesnut-brown ; fr. 4-9 in. 1., 2-4 in. br., oblong-deltoid, tripinnate ; pinnx dis- 

 tant, the lower ones deltoid ; the pinnl. stalked, with oblong segm. 1-1 1 lin. br. ; 

 texture subcoriaceous ; rachises wiiy, castaneous ; upper surface naked, lowei 

 densely coated with bright-yellow powder ; sori brown, extending from the edge 

 nearly to the midrib. — Gymnogramme, Hk. iSp. B.p. 146. Fil. Ex. t. 47. 



Hab. Central America. — Habit of the next, but the powder bright-yellow, and the sori 

 in a broader band. 



24. N. (Cine.) nivea, Desv. ; St. densely tufted, 4-6 in. 1., ohesnut-hrown, naked, 

 glossy, the scales linear, bright-ferruginous ; fr. 3-6 in. 1., 1^-2 in. br., ovate, 

 tripinnate ; pinnae distant, the lower ones deltoid ; the pinnl. long-:Stalked, with 

 blunt oblong or roundish terminal seffm. 1-2 lin. 1., f-1 lin. br. ; texture subcori- 

 aceous ; rachises wiry, glossy, castaneous ; upper surface naked, pale-green, 

 lower coated with pure-white powder ; sori brown. — Hi. Sp. 5. p. 111. 



Hab. Andes, from Mexico to Peru. — N. Hookeri, Lowe, t. 13, is a form known only in 

 cultivation, with close dilated segments and sessile pinnules. 



25. N. (Cine.) chilensis, Hk. ; st. tufted, 3-4 in. 1., stout, glossy, chesnut-brown, 

 nearly naked ; fr. 3-4 in. 1., 2 in. br., ovate, tripinnate ; pinnce distant, the lower 

 ones deltoid ; pinnl. sessile, deltoid ; the lower segm. linear-oblong, ^ in. 1., some- 

 times pinnatiiid ; texture subcoriaceous ; rachises polished ; upper surface naked, 

 pale-green, lower densely coated with white powder ; sori brown. — Hk. Sp. 5. 

 p. 112. t. 286. A. 



Hab. Juan Fernandez, — Probably this should be joined with the last. 



26. N. (Cine.) dmlbaia, Kunze ; st. densely tufted, 4-6 in. 1., slender, wiry, 

 chesnut-brown, the scales linear, ferruginous ; fr. 3-4 in. each way, deltoid, tri- 

 pinnate ; pinnce distant, the lower deltoid ; the lowestpinnl. deltoid ; lobes oblong, 

 obtuse, 1 lin. or less 1. by half as broad ; texture subcoriaceous ; rachises slender, 

 castaneous ; upper swrface naked, pale-green, lower coated with pure- white powder. 

 —Hk.Sp.b.p. 113. 



Hab. M.ssouri. — Very near N. nivea, but more slender, with closer and more numerous 

 pinns and smaller lobes. 



27. N. (Cine.) Fendleri, Kunze ; st. densely tufted, 2-3 in. I., wiry, chesnut- 

 brown, naked, the scales linear, bright-f erruginous ; /r. 2-3 in. eaeh way, deltoid, 

 tripinnate ; all the rachises very zigzag ; pinnce, pinnl., and segm. all stalked, 

 deltoid ; lobes close, oblong, blunt, not more than 1 lin. 1. by half as broad ; te3>r 

 ture subcoriaceous ; upper smrface naked, lower with fine white powder, — ILk. 

 Sp. 5.^5.113. 



Hab. New Mexico, Fmdler, 1017a. — Very near the last, from which it differs principally 

 by its very zigzag rachises. } 



Gen. 51. Monogrammb, Schk. 



Sori linear, close to the midrib on one or both sides. Small grass- or rush-like 

 plants, the simplest in structure of all the Ferns. 



