116 



FERNS : BEITISH AND FOREIGN. 



Sterile fronds pinnate, 1-2 feet long. Veins pinnate ; venules 

 acutely anastomosing, forming oblique elongated areoles ; 

 apices next the margin free and clavafce. Fertile fronds bipin- 

 nate ; segments convolute, wholly sporangiferous. 



1. S. serratifolium, Fee, Acrost. t. 43. Polybotrya serra- 

 tifolia, Klotzsch. Venezuela. 



41. STENOSEMIA, Presl 



Vernation fasciculate, erect. Fronds ternately pinnate, 6-18 

 inches high ; pinnae laciniately lobed, bulbiferous. Veins pin- 

 nate ; the lower venules transversely anastomosing, forming 



Genus 41. Portion of mature frond, upper side. No. 1. 



elongated costal and sub-costal areoles, the superior venules 

 free. Fertile segments linear, rachiform, convolute, nearly 

 wholly sporangiferous. 



1. S. aurita, Presl. Acrostichum auritum, Sw. ; Lowe's Ferns, 

 7, tt. 52, 53. Polybotrya aurita, Bl Fl Jew. t. 1 ; 

 HooJc. Fil Exot. t. 81. Java. 



