CLASSIFICATION OF FERNS. 
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11. A. Ceterach . Frond pinnate; pinnae sessile, scaly 
beneath. 
8. SCOLQPENDRIUM. 
1. S. vulgare. Fronds strap-shaped, entire. 
a . var. crispum. Fronds broad ; margin plaited. 
b . var. marginatum,. Fronds narrow; margin 
notched and lobed. 
c. var. multifidum . Fronds forked one or more 
times. 
d . var. polyschides . Fronds very narrow. 
e. var. lobatum. Fronds simply forked. 
/ var. rammum. Fronds forked from the stem. 
g. var. cristatum . Fronds crested. 
h . var. proliferum . Fronds extremely narrow, 
consisting of little beyond the rachis. 
i . var. fcecundum. Fronds bearing young plants. 
PTERIDE2E. 
9, Pteris. 
1. P. aquilina. Fronds subtriangular, bipinnate ; leaf- 
lets sessile, narrow, entire. 
a. var. vera. Pinnules pinnatifid. 
b. var. integerrima. All the pinnules entire. 
\ 
10. Cryptogramme. 
1. C. crispa . Fronds barren and fertile, tripinnate. 
11. Blechnum. 
1. B. boreale. Fronds pinnate, barren and fertile. 
