306 KEY TO THE GENERA. 
* FRUITING FRONDS PARTLY STERILE, 
2. Fruiting portion zz the m¢ddle of the 
frond. Interrupted fern. 
OSMUNDA, 
2. Fruiting portion at the apex of the 
frond. 
a. Sterile pinne palmate; rachis 
twining. Climbing fern. 
LyGODIUM. 
a. Sterile pinne fzunate ; fronds 
large; fertile portion gree, soon 
turning dvown. Royal fern. 
OSMUNDA, 
2. Fruiting portion apparently on a sep- 
arate stalk, above the sterile. 
b. Sterile portion ezfzre, thick ; fer- 
tile, a simple spzke. Adder’s 
tongue. 
Ophioglossum OPHIOGLOSSUM. 
6. Sterile portion more or less dz- 
vided , fruit in racemes or panicles 
occasionally in spikes. Moonwort : 
Grape ferns. 
Botrychium BOTRYCHIUM. 
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