WF 
Fronds more than 15 cm, wide, not of strictly erect posture 
Fronds distinctly thin-membranous and fragile, 
rather densely crowded in heavy vase-like 
tufts upon the rootcrown Se Athyrium filix-foemina 
+ Fronds not conspicuously thin-textured, borne 
individually along the elongated rhizome and 
not at all tufted > 
/\, Upper pinnae di@minishing in size rapidly, the 
aia oppositely disposed and rather distant 
e 5 
upon the rachis 8 Dryopteris spinulosa 
/,, Upper pinnae diminishing gradually in size to the 
tip, the lower alternately disposed and 
‘} on 
approximate upon the rachis 8~« Dryopteris filix-mas. 
