1 See Supplement 1. 

 VI. POLYPOr>I^CE^\JE. 



Sori definite, marginal, submarginal or dorsal, various in shape, puncti- 

 form, round, oblong, reniform^or linear, often indefinite and consisting of 

 numerous capsules crowded densely over the under surface or portions of 

 the under surface, occasionally extending + on both surfaces of the fronds. 

 Capsules usually stalked, provided vrith a longitudinal, incomplete annulus, 

 interrupted by the stalk (except in Plagiogyria, which has the capsules of 

 Cyatheae), opening [by a transversal stomium. Indusium wanting or present, 

 various in shape and size. 



Rhizome creeping or erect, rarely arborescent. Fronds various in shape, 

 size and appearance; veins free or anastomosing variously. 



A most extensive family inhabiting almost every part of the world. 



Arrangement of the tribes. 



A. Indusiatae. Indusium present. 



§ 1. WOODSIEAE. Sori globose, oblong or linear, situated on the back 

 or apex of a vein or veinlet. Indusium inferior, cupuliform, globose 

 or sausage-shaped, fastened all round the receptacle,/open at the 

 top or rupturing down irregularly. Stipes not articulate to the 

 rhizonie. 



§2.~ASPIDIEAE. Sori oblong, round or reniform, medial or terminal 

 on the veins. Indusium superior, of the same shape as the sorus, 

 fastened by a longitudinal axis, a central point or at the top of a 

 + deep sinus, opening all round the edge or nearly so. Stipes in 

 most of the genera not articulate to the rhizome. 



§ 3. DAVALLIEAE. Sori roundish, oblong or linear, rarely medial on 

 the veins but more generally submarginal and then solitary and ter- 

 minal on the vein tips or uniting theT^apices of 2 or more veins or 

 veinlets. Indusium + of^the same shape, attached at the inner side 

 of the sorus, opening outwardly. Stipes whether or not articulate 

 to the rhizome. 



§ 4. PTERIDEAE. SoriJ roundish, oblong or linear, submarginal, solitary 

 and terminal on the vein tips, often confluent into a submarginal line 



but apparently so in Diplaziopsis, 



