- 5 - 
43 
43 
Fronds entire .... 
Fronds pinnatifid »»•*•»«*•»*»**•• 
Grammitis 
• 44 
45 
45 
44 ~ Sor i confluent at ap ex o 5 xr ond ^ ^ '€&*. rs 
\ 
44 - Sort separate or discrete . •••••••»*••« Amphoradeniura 
- Sori single on ultimate divisions , with clavate parapnyses* •#•••• Amp nor ad e n 1 urn 
- Sori numerous on ultimate divisions, without clavate paraphyses ....* • 46 
46 - Lowest veinlets of adjacent segments meet and unite below the 
Sinus ...Cyclesorus 
46 - Lowest veinlets of adjacent segments neither meet nor unite 47 
47 - Fronds tapered toward both ends, hairs simple, not articulate*.»«•*•••« nastrea 
47 - Fronds not tapering toward both ends, hairs jointed 5. Ctenitis 
48 - Sori elongate 
48 - Sori roundish or oval 
«*« 
49 - Veins anastomosing, with free included veinlets 
49 - Veins free • »«*»*»•».....• * 
57 
49 
50 
51 
50 - Fronds pinnatifid, texture thin membranous 
Tectaria 
50 - Fronds pinnate, texture coriaceous ...... Cyr~omium 
51 - Pinnules articulate, stipes not articulate ... Nepnroiepis 
51 - Pinnules and stipes not articulate ... 
52 
52 - Lowest veinlets of adjacent segments meet and unite below the 
sinus.*..... Cyclosorus 
52 - Veinlets of adjacent segments neither meeting nor uniting 
53 
55 - First basal nerve in pinnule on the apical side of the midrib. Polys t ic hum 
53 - First basal nerve in pinnule on the basal side of the midrib...v 54 
54 - Fronds with articulate hairs .....Ctenicijs 
54 - Fronds paleate, glabrous or hairs not articulate 
55 
55 - Minor axes decurrent on major axes . ... . . •nryopteris 
55 - Minor axes not decurrent on major axes *..... 
56 
56 - Frond tapered at both ends ..... uasurea 
- Fronds oblong, scarcely narrowed above and below ♦ Cvstopteris_ 
56 
