228 FEENS : BEITISH AUD TOEEICN. 



116. HEMIDICTYTJM:, JPresl. 



Vernation fasciculate, erect. Fronds pinnate, 10-14 feet long ; 

 pinnse 1-2 foet long, 3-5 inches wide. Veins forked ; venules 

 parallel till near the margin, then anastomosing and reticulated. 



Qeaus 116. — Portiou of fertile yuiiia, under side. No. I. 



combined by a transverse, continuous, marginal vein. Sporangia 

 produced on the superior side of the parallel veins, constituting 

 unilateral, linear sori. Indusium plane. 



1. H. marginatum, Presl; SooJe. Gen. Fil. t. 65 A. Asple- 

 nium marginatum, Linn. {Flwm. Fil. t. 106) ; Sooh. 

 Fil. Exot. t. 73 ; Lowe's Ferns, 5, t. 53. Diplazium 

 giganteum, Sort. Linden. — Tropical America. 



117. CETEEACH, Willd. ; J. 8m. 



Vernation fasciculate, erect, csespitose. Fronds 2-12 inches 

 long, sinuose-pirmatifid or pinnate, the under side densely squa- 

 mose. Veins forked, anastomosing. Sporangia unUateral, 

 protruding through the dense squamae, forming oblong sori. 

 Indusiwm obsolete. 



