THE POLYPODIES. 29 
frond take their rise, bat this feature is much more obvious 
in P. Dryopteris. The fronds are divided so that each branch 
is pinnate at the base, and pinnatifid towards its point; the 
pinnae are also pinnate at their base, then pinnatind, becom¬ 
ing acute and nearly entire at the point; the pinnules and 
ultimate lobes are oblong and obtuse. The pair of pinnules 
at the base of each pinna, close to the principal rachis, an 
placed so that when the pinnae are exactly opposite they 
stand in the form of a cross; the two towards the apex of 
Pie. x 
