386 CRYPTOGAMIA FERNS. QCL. XXIV. 



2. POLYPO'DIUM. Son roundish, scattered. Cover none. 



3. WOO'DSIA. Son roundish, scattered. Cover fixed by a central 



stalk under each sorus, its margin divided into several hair-like 

 segments. 



4. ASPI'DIUM. Sori roundish, scattered. Cover round, fixed by 



the centre, separating all round. 



5. CYSTE'A. Sori roundish, scattered. Cover round, concave, fixed 



beneath by a lateral point, finally jagged and reflected. 



6. ASPLE'NIUM. Sori linear, scattered. Cover linear, opening at 



one side, towards the central rib or vein. 



7. SCOLOPE'NDRIUM. Sori linear, scattered in pairs, between 



two parallel veins. Covers two, linear, opposite. 



8. BLE'CHNUM. Sori linear, single, close to the central rib. Cover 



linear, flat, opening towards the rib. 



9. PTE'RIS. Sort linear, continuous, marginal. Cover formed of the 



inflected margin of the frond, opening inwards. 



10. ADIA'NTUM. Sori oblong or roundish. Covers formed of separate 



portions of the margin turned in. 



11. TRICHO'MANES. Sori oblong, imbedded in the edge of the 



frond. Cover marginal, pitcher-shaped, of one leaf, opening out- 

 wards. 



12. HYMENOPHY'LLUM. Sort roundish, imbedded in the edge of 



the frond. Cover marginal, compressed, two-valved, opening out- 

 wards. 



** Capsules destitute of a ring, in terminal $pike$. 



13. OSMU'NDA. Stater branched. Capsules stalked, globular. 



14. BO TRY'CHIUM. Common stalk compound, flattened. 



15. OPHIOGLO'SSUM. Spike two-rowed. 



Order II. LYCOPODINEJE. Plants having axillar or spiked 

 Capsules upon Stems furniihed with numerous small undi- 

 vided leaves. 



1. LYCOPO'DIUM. 



Order III EQUISETACE/E. Plants having a terminal spike, 

 consisting of angular scales bearing Capsules, containing 

 numerous Seeds, each furnished with four Stamens. 



1. EQUISE'TUM. 



Order I. FERNS. Plants consisting of a Frond, with dorsal 

 or terminal fructification. 



1. GRAMM1TIS. GRAMMITIS. 



Sori oblong or somewhat linear, straight, scattered. Cover 

 wanting, or reduced to a narrow membrane attached to the lower 

 margin of each sorus. Name from gramme, the Greek for a line, 

 from the lines of fructification. 460. 



1. G. Ceterdch. Scaly Grammitis, or Hart's-tongne. Frond pinnatifid, 

 Bcaly at the back. Frond from three to six inches high, leathery, ob- 



