Il8 WHERE TO FIND FERNS. 



diamond-shaped pinnules, which, in luxuriant specimens 

 are sometimes deeply cleft into unequally-shaped lobes, 

 and where the pinnules are not thus divided their upper 

 and broader edges are more or less conspicuously in- 

 dented. Fructification borne in elongated sori, covered, 

 when young, by pale-green indusia. When they have 

 become disrupted and thrown off the sori, by the en- 

 largement of the sporangia, become confluent and cover 

 the entire under surface of the fronds, turning them to a 

 rich reddish-brown. 



HABITATS. Rocks, brick and stone walls, bridge- 

 arches and old masonry, in shaded positions ; but this 

 fern often grows hardily in the sunshine. The parts of 

 walls and rocks selected by these little ferns are gene- 

 rally those where there are more or less moist seams of 

 earth or old crumbling mortar, and it will always be 

 found that the most luxuriant specimens of the Wall 

 Rue are those whose crowns are protected by some 

 jutting portion of stone over them. When the crowns 

 of this little plant are immersed in rocky crevices, so 

 that, though not buried in the earthy seams, the mois- 

 ture and shade of the crevices surround and protect 

 them from the desiccating effects of sun and wind, they 

 are in the most favourable position for developing luxu- 

 riant fronds. 



WHERE FOUND. In England, in the counties of 

 Bedford, Berks, Bucks, Cambridge, Chester, Cornwall, 

 Cumberland, Derby, Devon, Dorset, Durham, Essex, 

 Gloucester, Hants (the mainland and the Isle of Wight), 

 Hereford, Hertford, Kent, Lancaster, Leicester, Lincoln, 

 Middlesex, Monmouth, Norfolk, Northampton, North- 

 umberland, Nottingham, Oxford, Rutland, Salop, Somer- 

 set, Stafford, Suffolk, Surrey, Sussex, Warwick, West- 

 moreland, Wilts, Worcester, and York. In Wales, in 

 the counties of Anglesea, Cardigan, Caermarthen, 

 Caernarvon, Denbigh, Flint, Glamorgan, Merioneth, 

 Montgomery, Pembroke, and Radnor. In Scotland, in 



