If* Ferns 
or 
leafless plants with three angled stems 
A* Plants bearing scalelike n leaves M or appendages 
but appearing leafless from a short distance 
Psilotum nudum (L.) Griseb* 
AA* Plants bearii Is 
E« Fruiting bodies borne in clusters (sori) 
arranged In dots, lines, or larger areas on the ^ower sur* 
face of the frond; plant growing on the ground or some on 
supports; fertile and sterile fronds similar 
C * Tip of frond coiled at maturity 
x V 
Nephrolepis 
CC* Tip of frond not coiled at maturity 
Da Sori round or broad oblong 
Fronds jointed to rootstock 
Polypodium 
DLu Sori narrow, straight or curved 
■* 8 
Sori parallel to the mdrib, con¬ 
tinuous; rronas once or twice pin¬ 
nate 
Kants without trunk; fronds S- 
11 in • «* c «* B1 echnum 
EB # Sori more'or less oblique to mid** 
rib; fronds entire; ea« sorus with 
one cover which opens from the 
upper side Asplenium 
