l!2() ACROSTTCHUM QUERCIFOLIUM. 



Veins pinnate; venules compoundly anastomosing. 



Rhizoma creeping slowly. 



Sori amorphous, copious, and covering the whole under side 

 of the frond. 



Length of frond from three to six inches; the fertile frond 

 being nearly twice the length of the sterile one. 



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

 Cray; and for fronds both to Sir W. J. Hooker, of the Royal 

 Gardens, Kew, and to Mr. E,. Sim. 



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



The illustration is from a plant in my own collection. 



