206 



lEENS : BEITISH AJJD FOREIGN. 



106. ONOCIiEA, L. 



Vernation Tiniserial, distant ; 

 sarmentmn hypogseous. Sterile 

 fronds sub-bipinnatifid ; veins 

 reticulated. Fertile fronds 

 bipinnate ; veins free ; pinnules 

 contracted, sessile ; margins 

 conniving, forming unilateral 

 spikes (pinnae) of globose, bac- 

 ciform segments, each com- 

 pactly fiUed with sporangia, 

 which rise from four to six 

 punctiform, medial receptacles. 

 Special i/ndusvum lateral, very 

 membranous. 



1. O. sensibilis, lAm,. ; Schk. 

 Fil. t. 102 ; Hooh. 

 Gen. Fil. 4, 82 ; Lowe's 

 Ferns, 6, *. 1. Ono- 

 clea obtusiloba, Schh. 

 Fil. t. 103. — Noi-th 

 America. 



Genus 105. — Pinna of barren frond. No. i. 



107. LOB.INSERIA, Presl; Fee. 



Vernation uniserial, sarmentum hypogasous. 

 Fronds distant, siauose-pinnatifid or subpinnate, 

 1-1^ foot iigh, the fertile contracted. Veins 

 of the sterile frond uniform reticulated ; fertile 

 segments rachiform, costal anastomoses trans- 

 verse-elongated, sporangiferous. Bec^tacles 

 elongated .medial. Sori linear, contiguous, in 

 a costal row. 



coming reflezed. 



Indusiwm YaxHtei, involute, be- oenns 107.— Barren 



pmna, under side. 



