162 31. PTERIS, P^SIA. 



Philippine Islands. In some of the specimens, but not all, the costa of the pinnules is 

 spinulose on the upper side. 



37. P. deflexa, Link ; st. 2 ft. or more 1., strong, erect, naked or slightly 

 asperous below, straw-coloured or reddish-brown ; fr. ample, 2-4 ft. 1. ; terminal 

 pinna 6-9 in. 1., about 1 in. br., with a long point and numerous linear-oblong 

 lobes on each side, which are nearly cut down to the rachis, about ^ in. 1., in. br., 

 the barren ones sharply spinuloso-serrated ; lateral pinnae numerous, similar, the 

 lower ones stalked, the lowest pair much larger than the others, often more than 

 1 ft. 1., 6-9 in. br., with numerous pinnate pinnl. on each side ; rachises smooth ; 

 texture coriaceous ; veins once forked, ^ in. apart at the base ; sori reaching nearly 

 to the apex of the segments. -#. tip. 2. p. 190. P. stridens, Ag. Hk. Sp. 2. 

 p. 192. 



Hab. Tropical America, from the West Indies southward to Brazil and Peru. 

 P. Gaudichaudii, Ag., is either this species or closely allied. In general aspect this 

 species comes between guadriaurita and aquilina. 



38. P. coriacea, Desv. ; st. 1-2 ft. 1., erect, straw-coloured, asperous ; fr. 2 ft. 1. 

 or more, deltoid ; terminal pinna lanceolate, 6-9 in. 1., f in. br., with numerous 

 linear-lanceolate falcate lobes on each side, which are |-f in. 1., l-l4r lin. br., 

 sharply spinuloso-serrated when barren ; lateral pinnce a dozen or*more on each 

 side, similar, the lower ones slightly compound below, the lowest pair nearly as 

 large as the central portion of the frond ; pinnl. again bipinnate ; texture cori- 

 aceous ; partial rachises densely muricated with small prickles, which also run 

 along the midribs of the ultimate divisions beneath ; veins usually once forked, 

 about ^ in. apart at the base ; sori reaching nearly to the apex of the segments. 

 Hk. Sp. 2. p. 192. t. 124. A. /3, P. Jamesoni, Hk. ; lowest ultimate divisions 

 1 in. 1., in. br., sometimes decurrent at the base ; texture very coriaceous ; rachis 

 beneath scarcely muricated. Hk. Sp. 2. p. 194. 1. 193. 



Hab. Tropical America, from Venezuela along the Andes to Peru. P. muricata, Hk., 

 differs from /3 principally by its lower pinnae being conspicuously stalked at the base. 

 This species much resembles P. deflexa in general appearance, but may be known readily 

 by its muricated rachises. A muricated plant, gathered by Dr. Spruce in the Central 

 Andes (Nos. 5707 and 5665), is probably distinct. The stipe is strong and distinctly 

 prickly, and is marked in one of the numbers as 5, and in the other as 12 feet in length. 

 One of the pinnae is 2 feet long, the largest pinnule 10 inches, and the largest ultimate 

 segment 1 inch long, 2 lines broad. The venation is fainter than in P. coriacea, and both 

 surfaces are bright-green. What appears to be the same plant is in the Herbarium from 

 New Granada from Linden and Lieut. Norton, and these latter are the P. coriacea j3 of 

 the Sp. Fil. p. 192. 



39. P. brerisora, Baker ; st. 2-4 ft. 1., strong, erect, quite smooth ; fr. with 

 a central pinna 1-2 ft. 1., 6-9 in. br., and two opposite lateral ones which are nearly 

 as large ; pinnl. 4-6 in. 1., ^-f in. br., lanceolate acuminate, the lowest 1-2 in. 

 apart ; segm. numerous, \ in. 1., \ in. br., linear-oblong, blunt, very slightly 

 toothed ; texture herbaceous ; rachis naked ; sori in a continuous line along the 

 border of each segment. Hypolepis pteridioides, Hk. 2nd Cent. t. 59. 



Hab. Cameroon Mountains and Fernando Po, at an elevation of 4-7,000 ft. ; discovered 

 by Mr. Mann. 



Psesia, /St. Hilaire. Veins free, rhizome creeping, stems sub-distant, involucre 

 more or less distinctly double. Ornithopteris, Agardh. Sp. 40-43. According to 

 strict technical characters, this group of species, which differs from the rest of the 

 genus also in habit of growth, has as good a claim to be placed in Lindsavse as 

 Pteridese. TAB. III. f. 31, d, e, f. 



40. P. (Pasia) aquilina, L. ; rhizome stout, wide-creeping, subterraneous ; st. 

 ft. or more L, strong, erect, naked, straw-coloured or pale-chesnut ; fr. 2-4 ft. 



