L!72 ferns : British and foreign. 



2. O. vulgatum, Linn.; Sclih. 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 ; Sowerby's 

 Ferns, t. 46. — Temperate Zone of the Northern 

 Hemisphere. 



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



Fil. 1. 164).— Tropics. 



** Fronds pendulous; the sterile segments ribbcmrformed, 

 usually diclwtomously branched (Epiphytal). (Ophioderma.) 



5. O. pendulum, Linn. ; Hook, et Grev. Ic. Fil. 1. 19 ; Hook. 



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



6. O. furcatum,J. Sni. Ophioglossum pendulum ; ft furcatum, 



Fresl, Tent. Fterid. Supp. p. 56. — Queensland. 



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



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



— 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 ; 



Oraus 156.— Portion of slorile pinna, natural size ; ditto enlarged; 

 fertile spike, natural size. No. 1* 



