124 VI. POLYPODIACEAE. 



«.«. Sori definite. Sporangia gathered into sori, which are sometimes 

 contiguous or confluent, but always distinct when young. 

 b. Fronds articulate to the rhizome. Sori punctiform, round, oblong 

 or linear. § 10. Polypodieae. 



b.h. Fronds not articulate to the rhizome. 



c. Sori punctiform, round or oblong, not more than 2 X as 



long as broad, sometimes running into a submarginal line 



if terminal on the veins. § 7. Phegopterideae. 



C.C. Sori linear or linear-oblong, more than 2 X sls long as 



broad, continuous or interrupted, free or reticulate. 



d. Sori parallel to the costa or the margin, in 1 line on 



each side, free. § 9. Crammitideae. 



d.d. Sori more or less oblique to the costa and the margin - 



many on each side, free^r reticulate. 



§ 8. Grymnograiiiiiieae. 



§ 1. WOODSIEAE. 



£. Indusium globose or sausage-shaped, bursting down irregularly. 



S. Indusium globose; veins free. No. 12. Diacalpe. 



2.2. Indusium sausage-shaped; veins anastomosing. 



No. 13. Diplaziopsis. 

 1.1. Indusium cup-shaped, open at the top. No. 14. Dennstaedtia. 



§ 2. ASPIDIEAE. 



a. Stipes articulate to the rhizome. Indusium reniform, attached at the 

 top of the sinus. 



+. Fronds simple. No. 15. Oleandra. 



•{•••i-. Fronds pinnate; pinnae articulate to the rachis. 



No. 16. Arthropteriii. 



a.a. Stipes not articulate to the rhizome. Indusium oblong, rounder reniform; 

 if oblong fastened by its longitudinal axis, if round peltate, fastened by 

 a central point, if reniform attached at the top of its sinus, with the 

 lobes sometimes meeting or overlapping and then app/arii{ntly orbicular. 



