Bolton’s woodsia. 
143 
t BOLTON’S WOODSIA {natural size). 
Woodsia alpina, Newman. 
Woodsia hyperhorea. Smith, Hooker. 
Woodsia Ilvensis y. Babington. 
This is one of the rarest ferns in Britain ; it has only occurred 
in one Welch and two Scotch counties : it roots in the fissures 
of rocks in the wildest and most inaccessible mountain regions. 
Caernarvonshire. — This fern was found by Mr. Wilson 
on Clogwyn-y-Garnedd, one of the precipices of Snowdon 
which faces the east, as observed by that botanist, on whose 
