ACROSTICIIUM. lOS 



GENUS XIII. 



ACROSTICHUM. Linn^us. 



SoRi amorphous, universal on the under side of the fertile 

 frond. Venation uniform, reticulated in the normal form, and 

 having elongated areoles. Only one species is at present in 

 cultivation in this country. 



The section Pcecilopteris differs in having the venation pinnate 

 and the venules arcuately or angularly anastomosing. Fronds 

 pinnate. 



The section Gymnopteris differs in the pinnate veins having 

 the venules compoundly anastomosing. Fronds simple, lobed, 

 or pinnate. 



The section Polyhotrya has the veins pinnate and the venules 

 simple, free, and external. Fronds bi-tripinnate. 



The section Elaphoglossum has simple fronds. The veins 

 simple or forked, and internal; the venules parallel, their 

 apices being free and clavate, terminating within a thickened 

 margin. 



The section Lomariopsis has the veins uniform, simple, or 

 forked. Fronds pinnate. 



There are no British representatives. 



Mr. Moore, in his "Genera and Species of Cultivated Ferns," 

 gives — 



Elaphoglossum conforme, Schott. 



" crassinerve, Kunze. 



'' callge folium, J. Smith. 



" longifolium, J. Smith. 



" scolopendrifolium, J. Smith. 



" villosum, J. Smithy 



*' Dombeyanum, Fee. 



Polyhotrya cylindrica, Kaulfuss. 

 Acrostichum aureum, Linnceus. 



