206 



FERNS I BRITISH AND FOREIGN. 



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 (pinnae) 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. ; Sclik. 

 Fil. t. 102 ; Hook. 

 Gen.Filt.S2; Lowe's 

 Ferns, 6, t. 1. Ono- 

 clea obtusiloba, Sclik. 

 Fil. t. 103. North 

 America. 



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



107. LORINSEEIA, Presl; Fee. 



Vernation uniserial, sarmentum hypogceous. 

 Fronds distant, sinuose-pinnatifid or subpinnate, 

 1-1^ 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. Indusium vaulted, involute, be- Genus 107. Barren 

 coming reflexed. phina No. D i der "^ 



