﻿Maxon : North American species of Psilogramme 83 



petiolate, all sharply retrorse in attachment but immediately 

 curved upward, thus spreading or mostly ascending, the basal ones 

 the largest, these deltoid-oblong, 9 to ii cm. long, about 5 cm. 

 broad, consisting of about 5 pairs of spreading, mostly inequi- 

 lateral, obtuse, deltoid-oblong, deeply pinnatisect pinnules; ter- 

 tiary rachises castaneous nearly throughout, narrowly foliaceo- 

 marginate in the middle, or widely so toward the apex of the 

 secondary pinnae; segments of the larger pinnules mostly once 

 or twice dichotomous, the divisions divaricate, mostly simple, 

 2 to 5 mm. long, 1.5 to 2 mm. broad, slightly broader than the 

 widely foliaceous rachises of the pinnules; veins solitary, evident, 

 very slender, brownish, extending to a very narrow but deep 

 sinus in the rounded apex of the lobe; sporangia dark brown, 

 very numerous, those of two (rarely more) adjacent lobes joined 

 at the base. Leaf tissue membrano-papyraceous, grayish green, 

 fragile; hairs wholly lacking throughout, even among the sporangia. 

 Type in the U. S. National Herbarium, no. 827510, collected 

 in the forests of La Palma, Costa Rica, altitude 1,459 meters, 

 September 4, 1898, by A. Tonduz {no. 12531). Collected also at 

 the same place by Brade (March 17, 1908) and by the writer 

 {no. 398, May, 1906), these specimens smaller than the type 

 collection but otherwise identical. A specimen collected by 

 Wright at Omotepec, Nicaragua, while upon the North Pacific 

 Exploring Expedition, is certainly the same. 



Psilogramme glaberrima apparently lacks any very near rela- 

 tives. In several respects it somewhat resembles P. Orbignyana; 

 namely, in habit, in its flexuous secondary rachises, and in the 

 position and curvature of its secondary pinnae, these arising 

 retrorsely but being immediately curved and directed forward. 

 The resemblance ends here, however, P. Orbignyana having 

 numerous veinlets to the ultimate segments. 

 5. Psilogramme villosula Maxon, sp. no v. 



Rhizome wanting; fronds suberect, apparently 40 to 60 cm. 

 long; stipe incomplete, 2 to 2.5 mm. in diameter, woody, dark 

 castaneous, sublustrous, glabrescent; lamina oblong, apparently 

 30 to 40 cm. long, 12 to 25 cm. broad, tripinnate or almost quadri- 

 pinnate, the pinnules further divided; primary rachis similar to 

 the stipe, subpersistently short-villose with a thin covering of 

 short multicellular yellowish flattish hairs; primary pinnae alter- 

 nate, arising at an angle of about 45°, then recurved, deltoid- 

 oblong, acute, 8 to 15 cm. long, the secondary rachis subflexuous, 



