258 ACROSTICHUM, § IIETERONEURON. 



ones elongato-lanceolate pinnatifid, stipes paleaceous." Fee. 

 — Steiiosemia, Pr. Tent. Pterid. p. 237. Fee, Acrost. p. 83. 

 Polybotrya, Bl. Fil. Jav.p. 17- t. 11. 



Hub. Java, Blunie. — Tliis is only known in a sterile state, but the general habit 

 has considerable resemblance to that of St. aurita. The segments are much nar- 

 rower and the costse are more conspicuous. 



§ 10. Heteroneuron. — Fronds generally ample, dimorphous, pinnate, oftenvivi- 

 parous. ^^ Veins pinnate, from a central costa arcuately, angidarly, or irre- 

 gularly anastomosing, areoles sometimes producing exterior free or irregularly 

 anastomosing veinlets." — Gen. Heteroneuron, Fe'e. Campium and Pcecilopteris, 

 Eschw. and Pr., in part. Pcecilopteris, Moore. Cyrtogonium, J. Sm. Bol- 

 bitis, Schott. Jenkinsia, Hook. Gen. Fil. tab. LXXV. B {sori abnormal). 



For this section I prefer Fee's name of Heteroneuron as indicative of the 

 varied nature of the veining, and as sufficiently shown in the only two kinds 

 represented by Moore (Ind. Fil. pi. 7) under Pcecilopteris. The species he in- 

 cludes best correspond with my views of the group, but the characters are most 

 unsatisfactory. 



125. A. (Heteroneuron) punchdatum, hinn. ; caudex less 

 thick than a goose-quill creeping, stipites a span to a foot 

 long 1| of the fertile frond, fronds membranaceous pinnated, 

 piimse 3-11-12, 2-3 of the uppermost ones coadunate at the 

 base; sterile pinnae 4-9 inches long 1-1| inch wide ovate 

 or oblong acuminate often broader upwards more or less at- 

 tenuate and subpetiolate at the base entire at the margin or 

 serrate only at the apex, superior ones decurrent at the base, 

 lowest ones sometimes unequally bipartite, venation mani- 

 fest, costules present but obscure, veins subequally anasto- 

 mosing and forming angled areoles of which the largest and 

 most oblong are next the costa and costules, rarely including 

 a short solitary free veinlet ; fertile pinnae much smaller and 

 oblong, superior ones very obtuse. — Linn. Svppl. p. 441. 

 Sw. Syn. Fil. p. 13. Willd. Sp. PI. v. jo. 118. Pcecilopteris, 

 Pr. Cyrtogonium, J. Sm. Heteroneuron, Fee, Acrost. p. 

 92, t. 54 [very good). Acrost. auriculatum, Lam. A. Finlay- 

 sonianum, Wall. Cat. n. 2162. 



Hab. Bourbon and Mauritius, Commerson and others, Sieber, Syn. Fil. n. 24. 

 East tropical Africa: Johanna Islands, Dr. Kirk. West tropical Africa: Fer- 

 nando Po and Prince's Island, Barter, Mann ; and on the mainland south of the 

 equator, Curror. — Linnseus, and Swartz and Willdenow, following him, describe 

 the upper surface of the frond as punctated (whence the specific name). Fee 

 says the fertile fronds alone are ptinctated beneath. I find no punctuations on 

 my numerous specimens in one or the other case. 



126. A. {lleteroneuron) Jlagelliferum,Wa.\\.; caudex creep- 

 ing paleaceous thick as a goose-quill, stipites a span to a foot 

 and more long (longer of the fertile frond) scaly at the base, 



i 



