422 GO. ACROSTICHUil, **** If CHRYSODIUM. 



IIG. A. (Chrys.) tricuspe, Hk. ; rhizome woody, wide-creeping ; st. of barren 

 fr. nearly 1 ft. I., 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 areolae between them, with 

 free \einlets ; central lobe oi fertile fr. 1.3 in. 1., j in. br., the lateral ones erecto- 

 patent, rather shorter, the st. l\ ft. \.—Hk. jSp. 5. />. 272, t. 304. 



Hab. Sikkim, Mrs. Atliinson. — 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. (Chvy s.) fuviatile, Hk. ; rhizome firm, wide-creeping; st. 12-18 in. 1., 

 slightly scaly ; barren fr. varying from nan-ow-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-G 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 ; nreolce copious, without fi-ee veinlets ; fertile fr. 

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



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

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



118. A. (Chrys.) pandurifolium, 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 pin7ice ; texture pap^Taceous ; surfaces naked ; prin- 

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

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

 12-18 in. \.—Hk. Sp. 5. 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. (Chrys.) Heiidelotii, Hk. ; rhizome firm, wide-creeping; st. 6-9 in. 1., 

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

 patent pinnce on each side, which are 2-6 in. 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 areolce between them, with a few free 

 veinlets ; feHile fr. 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 pinnae are deeply toothed. 



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

 /;'. 4-9 in. I,, firm, erect, naked, the latter 1 ft. or more 1., 6-8 in. br., with 

 numerous erecto-patent pinncB on each side, which are 3-4 in. 1., \ in. br., 

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

 coriaceous ; no distinct main veins, the areoloe in 2-3 rows between the midrib 

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



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

 areolte much fewer and larger. 



121. A. (Chrys.) semicordatum. Baker ; rhizmne 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 pinnce 2-3 in. 1., ^-§ 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 



