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INTRODUCTION TO CRYPTOGAMIC EOTANV. 



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Marattiacea>. — Sporangia coriaceous, ringless, more or 



less confluent. 

 Osmundacece . — Ring imperfect ; sori naked. 

 Schizceaceai. — Ring terminal, sori in spikes or on resu- 



pinate lobes. 

 Parkeriacece. — Ring absent, or dorsal and imperfect ; 



sori marginal, continuous. 



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Acrostichacece. — Sporangia diffused; indusium 0. 

 Tcenitidece. — Sori linear, extending to the interstices ; 



indusium 0. 

 Orammitaoece. — Sori linear, confined to the veins or 



veinlets ; indusium 0, 

 Polypodiacece. — Sori apical ; indusium 0. 

 Vittariacece. — Sori seated in the grooved margin, 



which simulates an indusium. 



Adiantiaceos. — Sori linear, marginal, apical ; indu- 

 sium spurious, formed by the revolute 

 margin. 



Dieksoniaceic. — Sori globose, apical; indusium late- 

 ral, bivalvate. 



Davalliacece. — Sori apical, inframarginal ; indusium 

 univalvate. 



Aspleniacece. — Sori epineural ; indusium persistent, 

 lateral; margin free. 



Aspidiacece. — Sori subglobose ; indusium free ex- 

 cept at the point of attachment. 



Peranemaceoe.- — Indusium inferior, at length lobed or 

 ciliate. 



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Hymenophyllacecs . — Frond cellulari-reticulate. 



Cyatheacea. — Sporangia pedicellate, bursting late- 

 rally. 



Gfei'cAejM'accffi.^ Sporangia sessile or subsessile 

 bursting longitudinally. 



