PETRARCH'S FERN. 147 
otches_into three or five lobes, all of them rounded, 
blunt and delicately crenulate at the edge; but above 
the middle the pinne become alternate and oval, with- 
out any division into lobes, the edges being still deli- 
tely crenulate ; veins generally three, sometimes five, 
all running together into the foot-stalk of the pinna; 
the middle one again divided; each vein bears a linear 
mass of seeds on its side, and each of these masses is 
covered with a narrow, linear, white involucre, the free 
edge of which is quite smooth; in the lobes, these 
involucres open towards each other, face to face: as 
the seeds advance towards maturity they entirely cover 
‘the under surface of each pinnule, and are of a rich 
colour. 
This fern was found by M. Gittard in Greece; 
* 
ici iy,.88 the Madonip Hills at agp also 
beautiful little spécies to our list of British 
ture little can be said at present: I 
Tecommend the same mode as with Ruta- 
between which and Trichomanes it is precisely 
K2 
