272 FERNS: BRITISH AND FOREIGN. 



3. O. vulgatum, Linn. ; Sclik. Fil t. 153 ; Hook. Gen. Fil. 



t. 59 B ; Eng. Sot. t. 108 ; Lindl. and Moore's Brit. 

 Ferns, t. 51 B ; Hook. Brit. Ferns, t. 46 ; Sowerly's 

 Ferns, t. 46. Temperate Zone of the Northern 

 Hemisphere. 



4. O. reticulatum, Linn. ; Hook, et Grev. Ic. Fil. t. 20 (Plum. 



Fil. 1. 164). Tropics. 



** Fronds pendulous; the sterile segments ribbon-formed, 

 usually dicliotomously branched (Epiphytal). (Ophioderma.) 



5. O. pendulum, Linn. ; Hoofc. et Grev. Ic. Fil. . 19 ; Hook. 



Gard. Ferns, t. 33. Tropics of Eastern Hemisphere. 



6. O. furcatum, J. 8m. Ophioglossum pendulum ; /3 furcatum, 



Presl, Tent. Pterid. Supp. p. 56. Queensland. 



*** Fronds palmate, pendulous. (Cheiroglossa.) 



7. O. palmatum, Linn. (Plum. Fil 1. 163) ; Hook. Ic. PI. t. 4. 



West Indies, New Granada, Peru, Brazil, Mauritius. 



156. HELMINTHOSTACHYS, Kaulf. 



Fronds erect, with dissimilar sterile and fertile segments. 

 Sterile segments foliaceous, digitate, pedate. Veins forked; 



Genus 156. Portion of sterile pinna, natural size ; ditto enlarged; 

 fertile spike, natural size. No. 1. 



