V. CTSTOPTERIS. 73 
CrsTOPTERis FRAGILIS, Bernlianli : Hook and Arn. 572 : Bab. 
Man. 412: Florig. Brit. iv. 8-5: Newm. 1>5 : Franc. 29. C FRA- 
oiLis a. Hook. Sp. Fil. i. 197. CIATHEA FRAGILIS. Sm. Fl. Brit 
1139: En^. Bot 1587. CTATHEA CTNAPIFOLIA, Roth. CTATHEA 
ANTHRISCIFOLIA, Roth. CYSTEA FBAOILI8, Sm. Eng. Fl. iv. 285. 
POLTPODIUM FRAGILE, ],illtKVUS. P. CTNAPIFOLIUM. Hoffman. 
P. ANTHRISCIFOLIUM, HoffllJ. P. POLTMORPHUM, VUlaTS. P 
TRIFIDUM, Withering. ASPIDIUM FRAGILE, Swartz. 
/3. anyustata : fronds oblong-ovate; "pinnules linear- 
lanceolate, deeply and acutely pinnatifid, or slightly toothed 
on the margin ;" ultimate subdivisions oblong or linear ; 
sori distinct, sub-central. 
CTSTOPTERIS FRAGILIS, /? Franc. 30. C. DEJJTATA, 13 Hook. 
Brit. Fl. 5 ed. 441. CTATHEA FRAGILIS, /? and 7 Sm. FL Brit. 
1139. -CISTEA ANGUSTATA, Sm. Eng. Fl. iv. 288. 
7. dentatn : fronds oblong-lanceolate; "pinnules ovate- 
obtuse, bluntly toothed, rarely pinnatifid ;" sori sub-mar- 
ginal, often crowded, sometimes confluent. 
CTSTOPTERIS DENTATA, Hook. Brit. Fl. 5 ed. 441. Franc. 28. 
CTATHEA DENTAT A, Sm. Fl. Brit 1141. CTSTEA DENTATA, Sm. 
Eng. Fl. iv. 28.': Eng. Bot. 1588. POLTPODIUM DENTATUM, Dick- 
son. ASPIDIUM DESTATUM, Swartz. 
2. Dickieana : fronds ovate-lanceolate ; pinnae deflexed, 
overlapping ; pinnules crowded, broad obtuse, very slightly 
toothed ; sori marginal, distinct. 
CTSTOPTERIS DICKIEANA, Sim. Gard. .Tourn. (1848) 308: Newm, 
App. xxvi. C. FRAGILIS, var. DICKIEANA, Moore, in 1 ed. p. 81, and 
Bot Gaz. L 310. 
The Brittle Bladder-fern is an exceedingly variable 
plant, assuming several tolerably distinct forms ; but these 
are so closely connected by intermediate states, as hardly 
to admit of definition. Indeed it is possible to obtain from 
