162 31. PTEIIIS, §§ P.ESIA. 



PhMippine Islands. Costa of the pinnules is often spinulosfe on the upper side. I cannot 

 distinguish from this a Guatemalan Fteris gathered by Salvln and Godman. 



37. P. de/lexa, 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 6-0 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., J in. br., 

 the barren ones sharply spiniiloso-serrated ; lateral pinnce 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. oh each side ; rachises smooth ; 

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

 to the apex of the segments.— l?:t. iSp. 2. p. 190. P. stridens, Aff.. Bh. Sp. 2. 

 p. 192. P. platychlamys, Fie. 



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

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

 species comes between qaacl/i'iaMHta and aquilma. 



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., | in. br., with numerous ' 

 linear-lanceolate falcate lobes on each side, which are |-J in. 1., 1-1^ lin. br., 

 sharply spinuloso-serrated when barren ; later(i,l pinnw 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 raclmes densely muricated with small prickles, which also run 

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

 about J 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., J in. br., sometimes decurrent at the base ; textttre very coriaceous ; rachis 

 beneath scarcely muricated. — Si. Sp. 2. p. 194. 1. 193. 



Hab. Tropical America, from Venezuela a,long the Andes to Peru. — P. mur-icata, Hk., 

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

 This species much resembles P. d^exa in general appearance, but may be known readily 

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

 Andes (Nos. 6707 and 5666), is probably distinct. The stipe is strong and distinctly 

 prickly, and is marked in one of the numbers as 6, and in the other as 12 feet in length. 

 One of the.pinnse 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 jS of 

 the Sp. Fil. p. 192. 



39. P. Irevisora, 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., ^-| in. br., lanceolate acuminate, the lowest 1-2 in. 

 apart ; seffm. 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, Hi. 2nd Cent. t. 69. 



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

 by Mr. Mann. Differs f.om longipes by its shorter sori and broader involucre. 



§§ Psesia, St. Hilaire. Veins free, rhizome creeping, stems siib-di^ant, 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 stood a claim to be placed in Lindsavse as 

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



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

 1 ft. or more 1., strong, erect, naked straw-coloured or pale-chesniit ; fr, 2-4 ft. 



