KEY TO THE GENERA. 
KEY TO THE GRAPE FERNS. 
(Botrychium.) 
Plant large, fruiting in spring, sterile portion much divjded 
B. Virgintanum, 
Plant smaller. 
Fruiting in autumn, sterile wari ionig stalked, traneulay 
B. obliguum, 
Fruiting in summer . . 
Plant very fleshy, sterile potter with mostly iiinave seg- 
ments, . é . . . B&B. Lunaria. 
Plant less fleshy. . 
Sterile portion short stalked, above the middie of tire 
stem. . ‘ B. matricariefolium, 
Sterile portion stalled usually below the middle of the 
stem, . . . B. stinplex, 
Sterile portion seseile near the top of the stem 
B. lanceolatum, 
KEY TO THE WOOD FERNS. 
(Aspedium.) 
Fronds pinnate, the pinne pinnatifid, 
Blade thin, deciduous, 
Lower pinnz reduced to mere lobes 
: A. Noveboracense. 
Lower pinnz not or little reduced. 
Veins simple ‘ 5 A, stmulatum, 
Veins forked - - A, Thelypterts. 
Blade rather thick, evergreen. 
Fronds small, narrow, rock species A. fragrens. 
Fronds large, two or more feet high, 
Lower pinne, nearly triangular A. créstatum. 
Lower pinnz longer. 
Sori close to the margin. A, marginale. 
Sori nearer the midvein. 
Frond lanceolate. A, filix-mas. 
Frond ovate i A. Goldieanum, 
Fronds twice pinnate with lower pinnules pinnatifid. 4. Bootti?. 
Fronds nearly thrice pinnate =, A, spinulosum., 
grt 
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