148 ACROSTTCHUM AIJENUM. 



Acrostichum — From the Greek, ahros — liigli, and sticlios — order, 

 A lien u m — Different. 



I]s THE Section Gymnopteris of Authors. 



A very distinct Fern. 



An evergreen stove species. 



Native of South America, West Indies, Cuba, Jamaica, 

 Martinique, Trinidad, Portorico, Guadaloupe, Columbia, New 

 Granada, Equador, Panama, Mexico, and Guatemala. 



The fronds are pinnate, the pinnse being broad, lanceolate- 

 elongate, and pinnatifid, the upper ones confluent; the seg- 

 ments ovate and obtuse-denticulate; fertile pinnae contracted, 

 acuminate, and repand. Lower ones pinnatifid, upper ones 

 confluent. 



Stipes glabrous. 



Fronds arising from a somewhat creeping rhizoma. 



Veins costseform; venules compound anastomosing. 



Sori amorphous. 



Length of frond from twelve to twenty-four inches. 



For a frond my thanks are due to Mr. E. Sim, of Foot's 

 Cray. 



It can be procured of Mr. Sim, of Foot's Cray. 



The illustration is from Mr. Sim's frond. 



