﻿82 Maxon : North American species of Psilogramme 



or triangular-oblong, subacute, subfalcate, fully pinnate in the 

 basal part, the subflexuous secondary rachis elsewhere narrowly 

 foliaceo-marginate, densely clothed with spreading multicellular 

 hairs, these with a darkish terminal gland; pinnules 6 to lo pairs 

 below the short, cleft or parted apex, mostly spreading, the basal 

 pair slightly the largest or the 3 or 4 basal pairs subequal, regularly 

 pinnatisect to the foliaceous costa, laxly hirsute upon both 

 surfaces, more copiously so beneath, the hairs mostly gland-tipped; 

 segments 2 or 3 pairs below the obtuse usually tripartite apex, 

 mostly oblique, the larger ones inequilateral, obovate or trapezi- 

 form from a narrowly cuneate base, obliquely cleft into 2 or 3 

 lobes, these mostly bilobate at their tips; smaller segments nar- 

 rower, cuneiform, strongly decurrent, only 2 or 3-lobed; veins 

 very slender, dark brown above, subdichotomous, the 2 to 8 

 ultimate branches of each segment terminating at the faintly 

 emarginate apices of the lobes; sporangia very numerous, falling 

 short of the tips of the lobes but extending nearly to the base of 

 the segments, the linies widely confluent at maturity. Leaf tissue 

 yellowish green, delicately membrano-chartaceous. 



Type in the U. S. National Herbarium, no. 464844, collected 

 upon the Cerro del Boqueron, Chiapas, Mexico, September, 

 1 91 3, by Dr. C. A. Purpus {no. 6^22). A second and excellent 

 sheet of three fronds of the same number is at hand ; also a later 

 collection from Chiapas (Purpus 7210). 



Related to P. }iina and P. glandulosa of South America ; differ- 

 ing from the former in its narrower, fewer-veined segments and 

 its scantier, obviously glandular pubescence; and from the latter 

 very conspicuously in the much greater size and subdivision of 

 the lamina. 

 4. Psilogramme glaberrima Maxon, sp. nov. 



A weakly scandent or recumbent plant, the elongate fronds lax, 

 probably of tardily determinate growth. Rhizome and stipe 

 wanting in the material at hand; lamina apparently 1.5 to 2 

 meters long, 40 to 50 cm. broad, narrowly oblong, tripinnate- 

 quadripinnatisect, the segments of the fourth order i to 3 times 

 divaricately dichotomous; primary rachis slender (i mm. thick), 

 sinuous-flexuous, brownish castaneous, highly lustrous, perfectly 

 glabrous; primary pinnae alternate (those of the same side about 

 12 cm. apart), slightly ascending at their point of origin but lax, 

 apparently drooping, orbicular-deltoid, 20 to 25 cm. long, 15 to 

 20 cm. broad, the lustrous glabrous castaneous secondary rachis 

 sharply flexuous; secondary pinnae 4 or 5 pairs, contiguous, 



