206 



FEKNS I BRITISH AND FOEEIGN. 



106. ONOCLEA, L. 



Vernation uniserial, distant ; 

 sarmentum hypogseous. Sterile 

 fronds sub-bipinnatifid ; veins 

 reticulated. Fertile fronds 

 bipinnate ; veins free ; pinnules 

 contracted, sessile ; margins 

 conniving, forming unilateral 

 spikes (pinnee) of globose, bac- 

 ciform segments, each, com- 

 pactly filled with sporangia, 

 which rise from four to six 

 punctiform, medial receptacles. 

 Special indusium lateral, very- 

 membranous. 



1. O. sensibilis, Lin. ; ScJik. 

 Fil. t. 102 ; Hook. 

 Gen.Filt.S2; Lowe's 

 Ferns, 6, t. I. Ono- 

 clea obtusiloba, ScJik. 

 Fil. t. 103. North 

 America. 



Genus 106. Pinna of barren frond. No. 1. 



107. LORINSERIA, Presl; Fee. 



Vernation uniserial, sarmentum hypogasous. 

 Fronds distant, sinuose-pinnatifid or subpinnate, 

 11^ foot high, the fertile contracted. Veins 

 of the sterile frond uniform reticulated ; fertile 

 segments rachiform, costal anastomoses trans- 

 verse-elongated, sporangiferous. Receptacles 

 elongated , medial. Sori linear, contiguous, in 

 a costal row. Indusiwn, vaulted, involute, be- Genus 107. Barren 



,. , pinna, under side. 



coming renexed. No. i. 



