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INTRODUCTION TO CRYPTOGAMIC BOTANY. 



i=! .S 



a 



MarattiacecB. — Sporangia coriaceous, ringless, more or 



less confluent. 

 Osmundacece. — Ring imperfect ; sori naked. 

 Schizceacece. — Ring terminal, soi'i in spikes or on resu- 



pinate lobes. 

 Parlceriaceae. — Ring absent, or dorsal and imperfect ; 



sori marginal, continuous. 



Acrostichacew. — Sporangia diffused ; indusium 0. 

 Tcenitidece. — Sori linear, extending to the interstices ; 



indusium 0. 

 Qrammitaaeoi. — Sori linear, confined to the veins or 



veinlets ; indusium 0. 

 Polypodiacecs. — 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. 



Dicksoniacece, — Sori globose, apical; indusium late- 

 ral, bivalvate. 



Davalliacece. — Sori apical, inframarginal ; indusium 

 univalvate. 



Aspleniacece. — Sori epineural ; indusium persistent, 

 lateral ; margin free. 



Aspidiaceoe. — Sori subglobose ; indusium free ex- 

 cept at the point of attachment. 



P eranemaceoe. — Indusium inferior, at length lobed or 

 ciliate. 



Hymenophyllaeece . — Frond cell ulari-reticul ate. 



CyatheacecE. — Sporangia pedicellate, bursting late- 

 rally. 



Oleicheniacece. — Sporangia sessile or subsessile^ 

 bursting longitudinally. 



