ALLOSORTJS. POLYPODIUM. 419 



Tr. VI. OSMUNBEJE. 



18. OsMUNDA. Capsules clustered, arranged in a branched 

 spike terminating the frond. 



Suborder IV. OPHIOGLOSSACE^. 



Vernation straight. Rachis succulent. Capsules regularly 

 2-valved, sessile, in clusters on a sepai-ate branch of the frond. 



Tr. VII. OPHIOGLOSSEjE. 



19. BoTRYCHiuM. Capsules distinct, disposed in a com- 

 pound spike attached to a pinnate or bipinnate frond. 



20. Ophioglossum. Capsules connate, disposed in a simple 

 distichous spike attached to an undivided frond. 



Suborder I. Polypodiacea. Tribe I. Polypodiea. 



1. Allosorus .BerM^. Rock-brake. 



1. A. crispMS (Bernh.) ; barren fronds 2 — 3-pinnate, leaflets 

 wedgeshaped or linear-oblong often bifid at the end, leaflets of 

 the fertile fronds oblong.— N. 103. Pteris ^m., E. B. 1160. 

 Cryptogramma R. Br., Hook. — Fertile frond nearly triangular. 

 Veins alternate, often forked and each branch ending in a cluster 

 having no indusium but concealed by the reflexed edge of the 

 leaflet. Height 6 — 12 in. St. slender, very brittle. — Stony 

 places on mountains. P. VII. 



2. PoLYPODiTJM Linn. Polypody. 



* Clusters at the end of a veinlet, other veinlets hnobbed at the 

 end and not reaching the edge. Ctenopteris Newm. 



1. P.vulgare {h.); fronds deeply pinnatifld, lobes linear-ob- 

 long somewhat serrate all parallel upper ones gradually smaller. 

 — E.B. 1149. N. 111. — Ehizome brown, densely scaly, creep- 

 ing. Fronds strapshaped. Clusters large, on the upper part of 

 the frond. Lateral veins of the pinnae with 4 branches. Pinnse 

 occasionally bifid at the end, sometimes deeply serrate or even 

 (P. cambricum L.) doubly pinnatifid. — Shady banks, walls and 

 old trees. P. VIII.— X. Common Polypody. 



** Veinlets not knobbed but reaching the edge, all usually fertile, 

 clusters near the end of each. Gymnooabpium Newm. 



2. P. ? Phegopteris (L.) ; fronds pinnate, pinnae linear-lanceo- 



