GENUS II. 
ALLOSORUS, Bernhardi. 
GEN. CHAR Sort circular, at length confluent, at- 
tached near the apex of the venules, covered by the 
revolute margin of the pinnules of contracted fertile fronds. 
Veins free, mid-vein distinct, forked where soriferous. 
The only British species of this genus is an elegant little 
plant, somewhat resembling parsley, and assuming two or 
three distinct forms. The genus has considerable affinity 
with Pteris, from which however the unaltered condition 
of the indusioid margin, and the detached masses of spore- 
cases readily distinguish it. 
The name is derived from the Greek alias (various), and 
sorus (a heap), in allusion to the altered appearances of 
disposition presented by the son in the stages of their 
development. 
l. Allosorus crispus, Bernhardi. Rock Brakes, 
or Mountain Parsley. Fronds of two kinds, bi-tri-pinnate ; 
ultimate divisions of barren fronds wedge-shaped often 
bifid ; of the fertile linear-oblong. 
ALLOSORUS CBISPUS, Bernhardi : Bab. Man. 408 : Florlg. Brit 
iv. 47: Newm. 103. OSMUNDA CRISP A, Linn. PTERIS CRISP A, 
Linn. MS- : Sm. Eng. Fl. iv. 306 : Eng. Bot. 1160. CRTPTO- 
ORAMHA CKISPA, R. Br. : Hook andArn. Fl. 575: Franc. 57. 
PHOROLOBC? CWSPCS, Desv. 
