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GROUP III. 
OPHIOGLOSSACEjE. 
Vernation. The young fronds rolled up straight. 
Thecas. Situated upon a separate, naked branch of 
the frond; two-valved, and not surrounded 
by a ring. 
GROUP III; GENUS I. 
BOTRYCHIUM. 
Fructification. Thecae slightly stalked, and situated 
upon a triangular, naked, bi-pinnate branch 
of the frond. 
Venules. Free 
n 
