34 



-FILICES. 



[Hymenophyllum 



I. — Fronds glabrous ; margins toothed. 



Fronds 1-3 in. long, pinnate. Sori 

 supra-axillary 



Fronds ^-2 in. long, pinnatifid. Sori 

 solitary, terminal on the main 

 rachis, free 



Fronds minute, ^-f in. long, simple 

 or digitately-forked. Sori 1-3, 

 terminal on the segments 



Fronds 2- or 3-pinnatifid, ovate- 

 deltoid. Invol. sub-orbicular, 

 divided nearly to the base. 

 Receptacle always included ... 



Fronds 3-pinnatifid, ovate-lanceo- 

 late. Invol. obovate, tubular 

 below, divided not more than 

 half-way down. Receptacle 

 often exserted 



1. H. tunbridgense 



2. H. minimum. 



3. H. cheesemanii. 



4. H. bivalve. 



5. H. multifidum. 



II. — Fronds glabrous, or with hairs on the stipes, rachis and costa 

 only (except in No. 1 6) ; margins entire. 



* Fronds pinnatifid ; stipes and rachis more or less winged throughout. 



Stipes filiform. Frond pendulous, 

 flat, very delicate, 2-pinnatifid. 

 Invol. large, broad, compressed, 

 terminal, on the segments of 

 the upper pinnae 6. H. rarum. 



Fronds 3-pinnatifid, rather opaque, 

 reddish ; rachis glabrous ; seg- 

 ments linear, flat or concave ; 

 sori terminal or axillary, free ; 

 invol. broad, ovate 



Fronds 3- or 4-pinnatifid, opaque ; 

 rachis villous ; segments long, 

 narrow-linear ; sori always ter- 

 minal, free ; invol. broad, 

 orbicular 



Fronds S-pinnatifid ; stipes, rachis 

 and segments ci-isped or wavy ; 

 sori terminal or axillary, free ; 

 invol. broad, orbicular 



Fronds 2-pinnatifid dull-green ; 

 segments linear ; sori terminal, 

 free ; invol. narrow, lips deeply 

 toothed 



7. H. polyanthos. 



8. H. villosum. 



9. H. javanicum. 



10. H. montanum. 



