386 CRYPTOGAMIA FEUNS. [CL. XXIV. 



2. POLYPO'DIUM. Sort roundish, scattered. Cover none- 



3. WOO'DSIA. Sori 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'NDBIUM. 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'KIS. Sori 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 

 outwards. 



12. HYMENOPHY'LLUM. Sori roundish, imbedded in the edge 



of the frond. Cover marginal, compressed, two-valved, open- 

 ing outwards. 



** Capsules destitute of a ring, in terminal spikes. 



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



14. BOTRY'CHIUM. Common stalk compound, flattened. 



15. OPHIOGLO'SSUM. Spike two-rowed. 



Order II. LYCOPODINE^E. Plants having axillar or spiked 

 Capsules upon Stems furnished with numerous small undi- 

 vided leaves. 

 1. LYCOPODIUM. 



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. GPvAMMI'TIS. 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-tongue. Frond pin- 

 natifid, scaly at the back. Frond from three to six inches high, 



