AN ENUMERATION OP CULTIVATED PERNS. 



263 



plicate, each bearing on its inner side four rows of sessile, oval 

 sporangia, attached by their base and opening vertically. 



Genus 147. Portion of fertile frond, natural size ; spikeret 

 enlarged. No. 1. 



1. A. digitata, Wall. Schizasa digitata, Sw. ; Hook. Gcvrd. 

 Ferns, t. 49. East Indies ; Malayan, Philippine, 

 and Fiji Islands. 



TEIBE II. OSMUNDE.ZE. 



Sporangia globose, reticulated, short-pedicellate, oblique and 

 gibbous at the apex, opening by a vertical slit, sub-bivalved. 

 JRing incomplete or obsolete. 



148. OSMUNDA, Linn. 



Vernation fasciculate, erect, subarboreous. Fronds pinnate 

 or bipinnate, 3-10 feet high ; pinnae articulated with the rachis. 

 Veins forked ; venules free. Fertile fronds wholly, or the upper 

 or middle portion, contracted, forming simple or compound 

 porangiferous panicles. 



