1G6 



rHEKS : BRITISH AND FOREIGN. 



forked ; costa excentric ; venules direct, free, their apices clavate, 

 the anterior one Bporangiferous. Becejptacles oblong. Sori 



Genus 81.— Portion of mature frond, under silc. No. I. 



terminal, elliptical, marginal. Indusium oblong, attached lon- 

 gitudinally, hippocrepiform. 



1. D. lunulata, Desv. ; Hodlc. Gard. Ferns, t. 17. Didy-. 

 mochlrena truncatula, /. Sm. Cat. Cult. Ferns (1857). 

 Aspidium truncatulum, Sw. Aspidinm squamatum, 

 Willd. ; (Plum. Fil. t. 56). Didymochlsena sinuosa, 

 Desv. ; Hoolc. Gen. Fil. t. 8. Diplazium pulcherrimum, 

 Badd. Fil. Bras. t. 59. — Malayan Archipelago and 

 Tropical America. 



ff- Sori destitute of special indusium. 



§ 6. StruthiopterecB. Fertile fronds contracted; segments 

 revulute, forming a universal indusium, enclosing crowded 

 punctiform sori. 



82. STRUTHIOPTERIS, Willd. 



Vernation fasciculate, erect. Fronds pinnate or hipinnate 

 1-3 feet high. Veins pinnate; venules free, the fertile pinna? 

 contracted, linear, with membranous, revolute, conniving mar- 

 gins, forming a universal indusium. Beceptacles medial, base 



