264 ACROSTICHUM, § H ETERONEURON. 



Tern, 3Iafheivs, n. 1107 and 1796, Spruce (Tarapota, Eastern Peru), «. 4123 ; 

 Venezuela, Fendler, n. 311. — Certainly very nearly allied to A. Raddimmm, but 

 the pinnae are generally larger, and the caudex, though creeping, does not appear 

 to be scandent. The apes of tlie pinnae is not unfrequently proliferous. 



133. A. (Heteroneuron) Raddianum, Kze. ; caudex elon- 

 gated scandent partially sparingly subulato-paleaceous, sti- 

 pites 4-6 inches long generally longer of the fertile frond, 

 fronds membranaceous 10-18 inches or more long pinnated, 

 pinnse rather distant; sterile ones 3-6-7 inches long ^-f of 

 an inch wide petiolate lanceolate finely acuminated serrated 

 especially towards the apex sometin^es sublobato-serrate, 

 venation manifest, costules subveniform, veins anastomosing 

 and forming very large subtriangular costal areoles, the rest 

 smaller and more uniform, ultimate veinlets at a little distance 

 from the margin short free clavate;/er/?7e fronds much smaller, 

 the pinnse contracted linear-oblong. — Acrostichum, Kze. in 

 Herb. Imp. Vindob. [not Hook, and Grev.) . A, scandens,i?oc?f?i, 

 Fil.Bras.p. 6. t. 18, excl.syn. [not Linn.). Neurocallis, Moore. 

 Heteroneuron Raddianum, Fee, Acrost. p. 94. Poecilopteris, 

 Moore. 



Hab. Brazil, Raddi, Gardner, n. 100, Milne. Para, Spruce, n. 15. — This has 

 not the very uniform reticulation of the veins which constitutes Neurocallis, to 

 which genus, or section, Moore refers it. 



134. A. (Heteroneuron) Heudelotii, Bory ; caudex thicker 

 than a swan's quill black creeping and rooting under water, 

 stipites reddish-brown or black 3-4 inches to a span and 

 more long, fronds subcoriaceo-membranaceous 10-14 inches 

 longbroad-oblongo-lanceolatepinnated,pinnatifidatthe apex; 

 sterile pinnte 3-6-7 inches long 5 lines to f of an inch broad 

 linear-lanceolate acuminate acute or obtuse obliquely cuneate 

 at the base, intermediate ones decurrent, lowest ones distant 

 and subpetiolate, the niargin entire or bluntly serrate or even 

 serrato-pinnatifid, venation manifest, costules united by a 

 few transverse arched veins forming large costal areoles, the 

 rest are more or less anastomosing (very irregularly) with 

 occasional free included veinlets. — Var. major ; 14 inches 

 long, fronds very dark dull-green, stipites and rachis reddish- 

 brown, pinnae much acuminated. Gymnopteris Heudelotii, 

 Bory, in Fee, Acrost. p. 84, t. 45. Anapausia, Moore. — Var. 

 minor ; smaller, fronds less than a foot long, pinnse obtuse, 

 whole plant intensely black. 



Hab. Tropical. — N ax. major. Senegambia, //ewrfe/o/, " in aquis vivis." — Var. 

 minor. Sierra Leone, aquatic. Barter. East tropical Africa : Mangauja coun- 



