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