SYNOPSIS OF THE GENERA 
OF 
DERBYSHIRE FERNS. 
Order 1. Capsules with a jointed ring, more or less complete. 
POLYPODIACEiE. 
Tribe 1. Polypodineoe. Fruit on the back of the fronds. 
1. With a linear involucre, near the midrib . 
2. With a linear involucre, marginal . 
3. With a linear involucre, near the margin . 
4. With a linear oblong involucre, opening on the inner side 
5. With a linear oblong involucre, opening centrally . 
6. With a kidney-shaped involucre . 
7. With an emarginate, or orbicular involucre . 
8. Sori in roundish clusters scattered. Involucre reniform 
9. With a hood-shaped involucre, becoming cup-shaped ... 
10. Fruit without an involucre ... 
11. Fruit mixed with c.haffy scales . 
Tribe 5. Fruit in a two-lobed cup, marginal . 
Tribe 8. Fruit with traces of a jointed ring, two-valved, 
terminal to the frond ... 
(Order 2. Fruit dorsal, without a jointed ring. 
Page 
Blechnum . 13 
Pteris . 14 
Cryptogramma .viii 
Asplenium... 16-17-18-19 
Scolopendrium . 21 
Athyrium .1-2 
Polystichum . 11-12 
Lastrcea . 3-4-5-S 
Cystopteris . 15 
Polypodium .7-8-9-10 
Ceterach . 20 
Hymenophyllum .viii 
Osmunda ... 22 
Marsiliacece.) 
Order 3. Fruit marginal, without a jointed ring. 
OPHIOGLOSSACEvE. 
1. Fruit terminal to the branch, spiked. 
2. Fruit terminal to the branch, spike-compound 
Ophioglossum 
Botrychium .. 
24 
23 
