ASPLENIUM. 135 



pinnae. The upper margins of the pinnules are irregularly 

 toothed. The veins are rather indistinct, and there is no 

 midvein ; hut a series of veins arise from the base, becoming 

 branched in their progress towards the apex, the number 

 of ultimate branches usually corresponding with that of 

 the marginal teeth. Several sori are produced near the 

 centre of the junna, covered by indusia which open inwardly 

 with a jagged or irregularly sinuated margin. 



A common species, confined to rocks and walls, occurring 

 throughout Europe and in many parts «f North America. 

 It is not difficult of cultivation. 



Other names for this plant are the following : — Amesium 

 Huta-muraria, Scolopendrium Ruta-muraria. 



Asplenium viride, Hudson. 



The Green Spleetiwort. (Plate XIII. fig. 4.) 



This Fern has such a general resemblance to A. TricJio- 

 manes as to have been mistaken for it by casual ob- 

 servers. It is, however, quite distinct, and is most 

 readily known from A. Trichomanes by the colour of 

 its rachis, which is green in the upper part, while in the 

 latter it is black throughout. It is an evergreen tufted 

 species, producing narrow, linear, simply pinnate, bright 



