ACROSTICHr.M, § OLFERSIA. 255 



the base and (lecurreiit entire at the margin, veins subhori- 

 zontal slender evident on the under side, simple or forked 

 rarely here and there anastomosing all of them connivent 

 at the extremity and there forming an intramarginal vein ; 

 fertile fronds much narrower 1-li foot long 1-H inch wide 

 near the middle, lanceolate very nmch attenuated at the base 

 and long decurrent soriferous except at the edge beyond the 

 intramarginal vein. — Klfs. En. Fit. p. 63 {not BL). Brack. 

 Fil. U. S. Expl. Exp. p. 74. Olfersia, Pr. Aconiopteris 

 obtusa, Fee, Acrost. p. HO. t. 40. /. 2 {small specimens) . 



Ilab. Sandwich Islands, Chamisso, Douglas, n. 43, Brackcnridyp, Ilillebrand, 

 n. 54. Society Islands, Bidwill (fertile only, 2 inches broad, more ineuihraua- 

 ceous, and less decurrent at the base). 



What is the A. Vieillardii, Metten. Fil. Nov. Caled. p. 1, of which he says, 

 " Interspecies, nervisarcu intramarginali praeditis, generi Aconlopteridi, I'r. (Fee), 

 adscriptas, cuiu nulla nisi Acoriiopt. ohtusa, Fee, Acrost. p. 80. t. 40. f. 2, com- 

 paranduni ; in hac auteni arcus nervorum manifestus et margini approxiraatus, 

 non inimersus et reniotus a niargine attenuato" ? 



119. A. (Olfersia) longifoliuni, Jacq. ? ; caudex elongated 

 thick as a man's thumb apparently attached to the trunks of 

 trees rough below with the persistent bases of old stipites 

 paleaceous upwards and bearing the new stipites which are 

 4-5 inches long stramineous (as well as the costa) twice as 

 long as the fertile fronds, fronds thin membranaceous; 

 sterile ones 2-2-2 f^et long 2h inches broad near the middle, 

 lanceolate sharj)ly acuminate long and gradually decurrenti- 

 attenuate at the base, veins nearly horizontal slender simple 

 or forked all connected at the extremity with a nearly straight 

 marginal vein ; fertile fronds smaller and nmch narrower so- 

 riferous (except on the costa) to the very margin. — A. longi- 

 ioYwxin, Jacq. Cull. ii. p. 105? Sw. Syn. Fil. p. 9? ll'illd. 

 Sp. PL V. p. 105? Eat. in Fit. Wright, et Fendl. p. 195. 

 Aconiopteris, Fee. Acrost. p. 80. ^.41. Olfersia, Pr. Moore. 



Ilab. \Vest India Islands. Venezuela, Fendlcr, n. 283, 284. Merida, Morilz, 

 n. 324, inpart.— M. lee lias shown how impossible it is clearly to ascertain what 

 is the true Acrost. lonyifuUum, Jacq., and consequently of Swartz and Willdenow. 

 The present species is well detined by the evident marginal vein, to which the 

 transverse veins are united by their apices, hence an Aconiopteris of Presl. 



120. A. (Olfersia) subdiaplianum, Ilook. and Grev. ; caudex 

 thick ascending or sidjercct and very paleaceous as well as 

 the stipites and back of the costa with ferruginous squar- 

 rose ovato-lanccolate scales, stij)ites terminal tufted 2-6 

 inches long, those of the fertile fronds twice as long flexuose. 



