272 
FERNS : BRITISH AND FOREIGN. 
3. O. vulgatum, Linn. ; Schk. Fil. t. 153 ; Hook. Gen. Fil. 
t. 59 B ; Eng. Bot. t. 108 ; Lindl. and Moore’s Brit. 
Ferns, t. 51 B ; Hook. Brit. Ferns, t. 46 ; Sowerhfs 
Ferns, t. 46. — Temperate Zone of the Northern 
Hemisphere. 
4. O. reticulatum, Linn. ; Hook, et Grev. Ic. Fil. t. 20 (Plum. 
Fil. t. 164). — Tropics. 
** Fronds pendulous ; the sterile segments ribbon-formed, 
usually dichotomously branched (Epiphytal). (Ophioderma.) 
5. O. pendulum, Linn.; Hook, et Grev. Ic. Fil. t. 19; Hook. 
Gard. Ferns, t. 33. — Tropics of Eastern Hemisphere. 
6. O.furcatum,./. Sm. 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 j ditto enlarged; 
fertile spike, natural size. No. 1. 
