14 
TABLE OF BRITISH FERNS 
* Gymnogramme.® — Sori linear, no indnsinm : one 
only genns — Giymnogramma. 
A SPIDIE.& — Sori round or ronndish, springing from 
the back of the veins, having a special indusium : 
two genera — Polystichum, Lastrea. 
Aspleniej: — Sori oblong, or elongated, springing 
from the sides of the veins, having a special indn¬ 
sinm : four genera — Athyrium , Asplenium , Scolo- 
pendrium, Cetarack. 
Lomarie^] — Sori forming longitudinal lines between 
the midrib and margins of the leaflets, or divisions 
of the fronds, with a special indnsinm : one genns 
— Blechnum. 
Pteridej:—S ori borne npon the frond-margins, which 
are changed, continnonsly or interruptedly, into 
special indusia : one genns — Pteris. 
* Adiante.® — Sori in patches on the reflexed lobes 
of the frond-margins, which form indusia: one 
genns — Adiantum. 
Cystopteride.®—S ori with special oval indusia affixed 
behind and bent book-like over them : one genns 
— Cystopteris. 
Peranemej: — Sori roundish and springing from the 
back of the veins, with special involncriform or 
semi involncriform indusia : one genns — Woodsia. 
* Of Gymnogramme M —genus Gymnogramma —there is only 
one British species, the small-leafed Gymnogram—G. lepto- 
phylla, lately found in Jersey, hardly therefore a British fern 
at all. Of AdiantEjE again its one British genus, Adiantum has 
only one species, the common Maiden-hair Fern — A. Capillas 
Veneris, not found in the Lake District. Neither is the one 
British species of the genus Trichomanes, the Bristle Fern — 
T. radicans, 
