CYSTOPTERIS. 
2 
dilatatum , with less divided and shorter pinnules, broadly winged, 
fronds a shining dark green, sori prominent. 13x7 inches. 
6. Cambricum, Ashton. Found by the late Mr. Rowbotham (of 
Manchester) in Wales. The tip of the frond and pinnae longer 
and narrower than in Backhousei. 9x4!,- inches. 
*J. ciispum, Lowe, (crispum-cristatum, Jones). Found in the 
killarney district in 1832 by the late Colonel A. S. H. Lowe 
(Gosfield Hall), very distinct, crisp, and irregularly branched. 
10x5 niches. 
8. cuneatum, Kinahan. Sent to me in 1870 by Mr. Kinahan 
(Roebuck Park), fronds wedge-shaped. 
9 - densum, Stansjield. A pretty densely fronded form. 10X3.T 
inches. 
10. dilatatum, Backhouse. Found in Ireland by Mr. Backhouse, 
and named for its resemblance to Hymenophyllum dilatatum. 
13X7 inches. 
11. dissectum, Stansjield Broad and tapering to a point, finely 
divided ; beautiful. 15 x6J inches. 
12. clissectum-cuneatum, Birkenhead. Not unlike dissectum, 
but wedge-shaped, and scarcely differing from cuneatum. 
13. proliferum, Druery (bulbiferum, Jones). Found at Killarney ; 
bearing bulbils. In the possession of Professor Morris of Bath ; 
with him it has not borne bulbils. 
Tribe 4. DAVALLIE/E. 
THE BRITTLE BLADDER FERN. 
CYSTOPTERIS fragilis. — Bernhardt. 
A COMMON de- 
ciduous species, 
from the sea level 
to the summit of 
Ben Lawers (4,000 
ft., where its fronds 
have only a height 
of 2 inches), grow- 
ing on rocks and 
walls. The fronds 
sometimes attain 
Colour a dull 
Fig. 5. — Pinnae of Cystopteris fragilis (showing 
fructification). 
a length of 12 and occasionally 18 inches, 
green, Growing in spreading tufts, and cannot be 
mistaken for any other fern. It occurs throughout Europe and in 
many other parts of the world. 
Varieties. 
1. adiantoides, Lowe. Found near Dundee by myself. It is a 
large-growing, much-divided variety, with broad pinnae and pinnules 
(the superior basal one very large). 
2. angustata, Smith. Found in Devon, Derby, York, Cumber- 
land, Westmoreland, Carnarvon, Monmouth, Edinburgh, Perth, and 
Sligo. Length of frond 12 inches. Slender and very narrow, 
ending both in the pinnae and the fronds in long taper points. 
