FiLICES. 



Key to the families. 



Sporangia with a ring. 



Ring complete. 



c. Ring oblique, subvertical. 



d. Perns arborescent. Indusium wanting or pre^nt, but 

 then neither linear nor umbrella-shaped. 



I. Cyatlieaceae, 

 d.d. Perns not arborescent. Indusium linejir or umbrella- 

 shaped. 



e. Indusium umbrella-shaped. II. JOatoniaccae. 

 e.e. Indusium linear. 



VI. Polypodiaceale, No. 40, Phgiogyria. 



C.C. Ring ± horizontal, surrounding the sporangium like a belt. 



Receptacle inconspicuous, >dot-like. Indusium wanting. 



III. deicbeniaceae. 



Receptacle conspicuous^erect, oblong to columnar-flliform. 



Indusium present. / IV. Hymenopbyllaceae. 



Ring operculiform, gowning the apex of the sporangium. 



V. Sehizaeaceae. 

 h.h. Ring incomplete. 



X. Ring vertical, Kng, the extremities sometimes separated by 

 the stalk of ytne sporangium only. 



.'. Sori indefinite. Sporangia scattered irregularly on the 

 few/ longitudinal veins. VII. Parkeriaceae. 

 definite or indefinite, but then the sporangia densely 

 ^crowded over th§ parenchyma. 



VI. Polypodiaceae. 

 x.xy'Ring horizontal, short or consisting of a lateral group of 

 thickened cells only. VIII. Osmundaceae. 



ingia \ without a ring. 

 Sori on the under surface of normal fronds. 



IX. Marattiaceae. 



Sporangia not gathered into sori, placed on much contracted, 



spicate or paniculate segments originating from the base, the 



centre or the margin of the leafy, barren segment. 



X — Qphioglo iiii aeGac ii 



