THE RUE-LEAVED SPLEENWORT. 125 
hooked at the point; sometimes the pinna becomes an enlarged 
branch. The whole growth is irregular and monstrous. It was 
found at Mucruss, Killarney, by Dr. Allchin; and a somewhat 
similar form has been gathered at Black Head, Clare, by Mr. Bar- 
rington. [Plate LXXIX C.] | ` 
8. variabile (M.). This sub-tripinnate variety is remarkable for 
the variety of form presented in the fronds. The more normal- 
looking fronds have the pinnules obovate-wedge-shaped, distant, 
spreading, and inciso-dentate at the apex; but some fronds are 
considerably depauperated, both pinn® and pinnules irregular in 
development, the latter much reduced in size, and having two or 
three horn-like lobes instead of teeth; one side of the frond on the 
upper portion is frequently still less produced. Between the normal ` 
and the depauperated fronds, there are many intermediate states. 
It has been sent from Settle, Yorkshire, by Mr. A. Clapham. 
9. sectum (M.). A small form with the pinnules incised at the 
ends, two or three of the segments being usually longer than the 
others, and producing a forked or trifid or laciniated appearance. 
It was found at Arnside by Mr. J. Crossfield. 
10. cristatum (Woll.). This is an interesting permanent variety, 
nearly all the fronds being affected. The best form is bipinnate, 
with narrowish pinnules, those which terminate the frond and 
the pinne being dilated at the apex, and somewhat crispy. 
This form has been found near Ruthin Castle, Denbighshire, by 
Mr. J. Daniels. In other forms the fronds are more variable: some 
are crowded or tasselled at their apices, others have their apical 
lobes, as it were, folded on each other, and not unfrequently the 
rachis is divided ; while the pinnules vary somewhat in nearly every 
plant. It has also been found in—Surrey: near Guildford, Dr. 
Allchin. Kent: near Tunbridge Wells, G. B. Wollaston. A pro- 
liferous form (proliferum, Woll.) has young plants seated in the 
axils of the pinnules; it was found by Dr. Allchin, sparingly 
mingled with the former. [Plate LX XIX B.] 
11. ramosum. (M.) A curious form, branched in the stipites 
and in the rachides below the pinnules, which latter are angular in 
form and sometimes partially depauperated. It was found at Arn- 
side by Mr. J. Crossfield. 

