100. MARSILEACE^. 429 



involucres forwards. Valves of the involucre convex or gibbous 

 throughout, touching only by their edges which are quite entire. 

 — ^Amongst moss in damp and shady places. P. VII. 



Suborder III. Osmundacea. Tribe VI. Osmundea. 



18. OsMTJNDA Linn. Flovyering-fem. 



1. 0. regalis (L.); fronds bipinnate, pinnules oblong nearly 

 entire dilated and slightly auricled at the base, clusters panicled 

 terminal. — E. B. 209. N. 331.— Fronds erect or drooping, 1—8 

 feet high. — Boggy places. P. VII. — IX. 



Subord. IV. Ophioglossacem. Tr. VII. Ophioglossea. 



19. BoTRYCHiTJM Sw. Moou-wort. 



1. B. Lunaria (Sw.) ; frond pinnate solitary, pinnse lunate or 

 fanshaped notched or crenate. — E. B. 318. N. 137. — Height 

 3 — 6 in. Pinna3 with veins radiating from the petiole, some- 

 times deeply notched. Fronds usually solitary, but sometimes 

 two on the same stalk. — Pastures. P. VI. VII. 



[B. rutaceum (Sw.) ; frond triangular-rhomboidal pinnatifid 

 solitary, pinnae 7 — 9 linear incise-serrate decreasing upwards. 

 — N. ed. 3. 322. — Veins not radiating. The species is doubtful. 

 —Sands of Barry, Forfar. P. VIII.] 



20. Ophioglossxjm Idnn. Adder's-tongue. 



1. 0.»MZ(?atera(L.); frond ovate obtuse.— E.B. 108. iV. 349. 

 — Height 4 — 12 in., erect. Spike clubshaped, usually rather 

 longer than the frond, sometimes very long. — Pastm-es. P.V. VI. 



[2. ? 0. lusitanicum (L.) ; frond linear-lanceolate. — N. ed. 3. 

 331. S. 47.— Height 1 — 2 inches, erect. — Petit Bo Bay, Guern- 

 sey. Mr. G. Wolsey. P. I.] 



Order C. MARSILEACE^E. 



Creeping plants with alternate erect leaves having a circinate 

 vernation. Fructification consisting of globular nearly sessile 

 coriaceous bodies with 3 or 4 cells and containing sacs including 

 either other bodies that germinate or loose granules. 



