422 60. ACROSTICHUM, ■**** tt CHRTSODIUM. 



116. A, (Chiys.) tricuspe, Hk. ; rhkome woody, Tvide-creeping ; st, of barren 

 fr. nearly 1 ft. 1., firm, naked ; barren fr. composed of three entire oblong lobes, 

 the terminal one G in. 1., 2 in. br., the lateral ones spreading, rather smaller ; 

 texture coriaceous; surfaces naked; main veins fine,- not distinct to the edge, 

 connected by transverse veinlets with copious small areolce between them, with 

 free \ einlets ; central lobe oi fertile fr. 13 in. 1., J in. br., the, lateral ones erecto- 

 patent, rather shorter, the St. 1| ft. l.—Hk. Sp. 5. p. 272. t. 304. 



Hab. Sikkim, Mrs. AtJeinson.Y-One of the specimens has the upper half of two out of 

 the three lobes contracted and soriferous, thus connecting this group with Hymenolepis. 



117. A. (Clays.) fluviatile, Hk. ; rhizome S,vm, wide-creeping; st. 12-18 in. 1., 

 slightly scaly ; barren fr. varying from narrow-oblong, entire, 1 ft. 1., 3 in. br., 

 to 2 ft. 1., 1 ft. br., deeply pinnatifid, with a large lanceolate terminal lobe and 

 1-3 pairs of lateral ones, which are 2-6 in. 1., 1-1-| in. br., the apex acuminate, 

 the edge entire ; texture papyraceous ; surfaces naked ; main veins not distinct 

 more than halfway to the edge ; areolce copious, without free veinlets ; fertile fr. 

 like the other, but smaller, the st. 2 ft.' 1. — Hk. Sp. 5. p. 274. 



Hab. Guinea Coast ; gathered by Curror, Barter, and Mann, — Most like A. punctu- 

 latam, but less divided, with main veins less distinct. 

 / 



118. A. (Chrys.) pandwifoliiim, Hk. ; rhizome firm, wide-creeping; st. of 

 barren fr. 6-12 in. 1., firm, slightly scaly ; barren fr. 9-12 in. 1., 3 in. br., 

 narrow-oblong, the edge entire, and below this sometimes a pair of small round 

 or oblong spreading sessile pinnae ; texture papyraceous ; surfaces naked ; prin- 

 .cipal veins zigzag, not distinct to the edge ; areolae copious, with abundant free 

 veinlets ; barren fr. similay, but the principal division 4-6 in. L, 1 in. br., the st. 

 12-18 in. \.—Hh. Sp. B. p. 271. Gymnopteris, Bk. 2nd Cent. t. 87. 



Hab. Andes of Peru, Spruce 4741, 5684. 



C. Barren fronds copiously pinnate, Sp. 119-127. 



119. A. (C)irys.) Heudelotii, Hk. ; rHzome firm, \yide-creeping ; st. 6-9 in. 1., 

 firm, erect, naked ; bwrren fr. 12-18 in. 1., 6-10 in. br., with numerous erecto- 

 patent pinnm on each side, which are 2-6 in. 1., -^-1 in. br., narrowed to both 

 ends, the point blunt or acute, the edge nearly entire, all sessile ; texture sub- 

 coriaceous ; rachis and both sides naked ; veins very fine, the main ones not 

 straight to the edge, with copious irregular areolae between them, with a few free 

 veinlets ; /ejtifo /r. -similar, but the pinnae narrower. — Hk. Sp. 5. p. 264. 



Hab. Senegambia, Sierra Leone, Zambesi-land. — A plant gathered by Barter, growing 

 under water at Sierra Leone, may be a form. The texture is pellucid, the whole plant 

 much smaller, and the pinnee are deeply toothed. 



120. A. (Chrys.) salicinum, Hk. ; rhizome stout, short-creeping ; st. of barren 

 fr. 4-9 in. 1., firm, erect, naked, the latter 1 ft. or more 1., 6-8 in. br., with 

 numerous ereoto-patent pinnoe on each side, which are 3-4 in. 1., I in. br., 

 narrowed to both ends, the edge repand, the lower ones stalked ; texture sub- 

 coriaceous ; no distinct main veins, the a/reolm in 2-3 rows between the midrib 

 and edge, almost without free veinlets ; fertile fr. similar. — Hh. Sp. 5. p. 265.- 



Hab. Sierra Leone, Barter ; Fernando Po, Mann. — Like the last in habit, but the 

 areolae much fewer and larger. 



121. A. (Chrys.) semicordatum. Baker ; rhizome woody, short-creeping; st. of 

 barren fr. 6-8 in. 1., erect, nearly naked ; barren fr. 8-12 in. 1., 3-4 in. br., 

 sometimes proliferous at the apex ; lower pinnw 2-3 in. 1., ^f in. br., the edge 

 inciso-crenate throughout, the base cordate on the upper, truncate on the lower 

 side ; texture herbaceous ; surfaces naked ; veins fine, the main ones distinct 



