THE FERNS OF NICARAGUA. 



I 99 



Meehan, Nat. Fl. and Ferns of U. S., p. 13. pi. 4: Fourn., Sertum Nic, 

 p. 252 ; Underwood, Our Nat. Ferns and All., p. Si ; Chapm., Fl. So. St., 

 p. 58S; Ilenisl.. Biol. Cent. Am., vol. in, p. 660: Bak., Biol. Cent. Am., 

 vol. iv, p. 116; Gray, Man. Bot., p. 680; Bom. et Ch., Fil., p. 224. 



Marginaria incana Presl, Tent. Pter., p. 1S8, pi. vn, fig. 27. 



Lepicysth incana Swz.,- —Smith, Hist. Fil., p. 112; Smith, Ferns, Br. and 

 For., p. 80. 



This widely distributed species was rather common on tile 

 roofs at San Carlos, and on fence-posts near Moyogalpa, 

 Ometepe. 



Reported (as incanum} from Ometepe by Fournier and 

 Hemsley. 



8. P. MACBRIDENSE nOV. Sp. PI. XX, Figs. 6-9. 



Rootstock short, rather slender, creeping, densely covered 

 with broadly-ovate, entire or scarcely fimbriated white scales; 

 stipe 1 to 2^ inches long, erect, rather stout, rigid, light- 

 brown, densely covered with white peltate scales which are 

 finally more or less deciduous: racliis similar to the stipe, but 

 with the scales more persistent \ fronds 3 to 9 inches long, y% 

 to 7/% of an inch wide, pinnate to the apex, or the upper pinnae 

 very slightly connected; -piniue spreading, very coriaceous, 

 obtuse, 20 to 40 on a side, dilated at the base especially on 

 the upper side, diminishing but slightly, if at all, downward, 

 dark-green above, the color more or less obscured by white, 

 peltate scales, the lower surface white with a dense covering 

 of similar scales; the terminal pinna, or division, is narrow, 

 somewhat caudate, obtuse, usually slightly dilated toward the 

 apex, in length equal to or greater than the largest lateral 

 pinnae; veins obscure; sort in a single series about midway 

 between the midrib and margin, in fully matured fronds almost 

 covering the lower surface of the terminal half of the frond. 



The scales, which densely cover all parts of the plant, are 

 uniformly white (even in very young fronds), peltate toward 

 the base, broadly lanceolate or ovate, and, excepting upon the 

 rootstock, with the margin more or less deeply fimbriated, 

 but none of them are hair-like. They are especially promi- 

 nent on the lower surface of the frond, which they densely 

 cover, their black centers giving it a punctate appearance. 

 IV— 2 Q 



