Arrangement of the sections. 



§ 1. EUHYMENOPHYLLUM. Ultimate segments of the fronds entire. 

 § 2. LEPTOCIONIUM. Ultimate segments spinuloso-denticulate. 



§ 1. EUHYMENOPHYLLUM. 



a. Fronds naked. 



h. Main rachis not ivinged, or winged towards the apex only. 



c. Fronds under 5 c.M. long at least when barren.{i) H. discosum. 

 C.C. Fronds more than 5 c.M. long. 



d. Ultimate segments crisped or complicate. (2) H. ooides. 



d.d. Ultimate segments flattened. 



e. Pinnae rather distant. (3) H. eximium. 



e.e. Pinnae rather imbricating. 



f. Ultimate segments eniarginate at the apex. Valves 



of the indusium slightly repand. (4) H. modestum. 



f.f. Ultimate segments entire as are the valves of the 



indusium. (5) H. flabellatum. 



b.b. Main rachis winged throughout. 



±. Valves of the indusium more or less toothed at the outer edge. 

 $. Edges crisped. (6) H. australe. 



$.§. Edges not crisped. 



* Indusium longer than broad. (7) H. demissum. 



•* Indusium not longer than broad. (9) H. badium. 



±.t. Valves of the indusium entire, or rarely cremate at the apex. 

 2. Fronds mostly 2 — 5 c.M. long. 



^. Sori numerous on the higher pinnae. Receptacle included. 



(10) H. paniculiflorum. 

 +.^. Sori solitary on the higher pinnae. Receptacle exserted. 



(11) H. ringens. 

 9.S. Fully developed fronds mostly 5 — i5 c.M. long. 



3. Edges crisped. (12) H. thuidium. 



3.3. Edges not crisped. 



A. Stipes winged + throughout. (15) H. salakense. 

 S:.4:. Stipes not winged, or winged towards the apex only. 



