184 



all similar, bearing the sori on the contracted 

 apex ; stipes adherent to the rhizome. 

 ' (a) Barren frond entire. 



i. G. variabilis. 



(b) Barren fronds sometimes simple, but 

 at least one or two pairs of distinct pinnae when 

 fully developed. 



(i) Barren fronds more or less oak-leaf- 

 shaped consisting of a Jobed termi- 

 nal pinna and a pair of unequal 

 sided lateral pinnae. 



2. G. qucrcifolia. 



(ii) Barren fronds simple, trifoliate or 

 pinnate, the terminal pinnae being 

 elongated and proliferous. 



3. G. flag e llifer a. 



(c) Barren fronds copiously pinnate. 



(i) Main veins conspicuous two-thirds of 

 the way to the margin; meshes 

 abutting on the costa without any 

 included veinlets, others including 

 several veinlets which are either 

 free with elevate apices or join 

 with the mesh above. 



4. G. contaminans. 



