ACROSTICIIUM, § GYMNOPTERIS. 271 



Ilab. Gaboon River, west tropical Africa, lat. 1° N., Guslav Mann. — This has 

 some affinity in forni and venation with our next species, A. pandurifuliuni, hut 

 the form and structure at the base are extremely different; the ultimate areoles 

 are by no means so numerous, nor the free included veins, nor are the latter 

 branched. 



147. A. (Gymnopteris) pandurifoUum, Hook. ; caudex 

 creeping thick as a goose-quill copiously scaly and rooting, 

 stipites approximate paleaceo-squaniose about a foot long, H 

 of the sterile ; sterile fronds membranaceous a foot long 

 3-3^ inches wide simple and panduriform having two round 

 sinuose lobes at the base, or ovato- or oblongo-lanceolate 

 acuminate with two small subrotund ))innfe at the base, cos- 

 tules remote flexuose united by transverse nearly straight 

 veins forming subquadrangular rather large areoles smaller 

 towards the margin including sometimes smaller areoles or 

 free and divaricating branched veiidets ; fertile fronds very 

 much smaller lanceolato-panduriform or ternate with the 

 terminal pinna lanceolate, the two lateral ones or auricles 

 rounded and petiolate. — Gymnopteris pandurifolia, Hook. 2d 

 Cent, of Ferns, t.S7. 



Hal). Mount Guayrapurima, near Tarapota, Eastern Peru, Spruce, n. 4741, 

 and (the ternate-fronded form) Chimbornzo, alt. 3000 feet, n. 5084. — Sitice I 

 published the simple-fronded form of this, I have received from Mr. Spruce a 

 state, as I believe, of the same species, with two basal lobes separate and forming 

 two distinct lateral pitiiuc or auricles. If more decidedly pinnated, it might pass 

 into Acrost. nicotiancefoUuni. 



148. A. (Gymnopteris) bicuspe. Hook. ; caudex creeping 

 and as well as the base of the stipes densely clothed with 

 aureo-fulvous silky hairs, stipites 1-1 4 foot (of the sterile 

 frond) long channelled on the anterior side, dilated upwards, 

 fronds coriaceous sim|)le pale-green ; sterile ones 6-8 inches 

 long :i-d\ inches broad ovate-acuminate quite entire and tri- 

 costate, or suborbiculate and deeply (to the middle) bicuspidate 

 6 inches broad and as much long G-8costate with the acu- 

 minated segments divaricating, entire at the margin, venation 

 conspicuous, primary veins anastomosing and forming large 

 subquadrangular areoles enclosing a network of smaller 

 areoles with copious free branched and divaricating included 

 veinlets ; fertile frond always entire 6-9 inches long 6-8 

 lines wide lanceolate acuminate tricostate, the margin 

 thickened, sori fulvous covering the surface except on the 

 costfE and margin. — Polypodium, HI. Fil. Juv. p. 125. Ana- 

 pausia, Moore. Cheiropleuria, /V. Eat. Acrostichum tri- 



