Sub-Orders, Tribes and Geiiera. 63 



** ]^eins more or less reticulated. 



XIV. Woodwardia, Sm. Sori linear or oblong, forming 

 chain-like rows. Indusia separate. 



Tribe VII. ASPLENIE.(E. Sori dorsal, linear or oblong, 

 oblique to the midrib, or rarely sub-parallel with it. Indusium fixed 

 by one margin to the veinlet, opening at the other, sometime^ 

 double. 



"' J^eins/ree. 



XV. Asplenium, L. Sori on the upper side of a fertile vein- 

 let, rarely fm both sides. 



XVI. Scolopendrium, Sm. Sori linear, confluent in pairs, 

 which appear like a single sorus with the double indusium open- 

 ing in the middle. 



** Veins reticulated. 



XVII. Camptosorus, Link. Sori oblong or linear, borne 

 partly on veins parallel to the midrib, partly on veins oblique to 

 to the midrib. 



Tribe VIII. ASPIDIE^. Sori dorsal, round or roundish, on 

 the back or rarely on the apex of a vein. Indusium usually mem- 

 branous, rarely wanting. 



""■ Without indusia. 



XVIII. Phegopteris, Fee. .Sori round, rather small, borne on 

 the back of the free veins. 



** With indusia. 

 ■\ Indusia superior. 



XIX. Aspidium, Swz. Indusium orbicular and fixed by the 

 centre or reniform and fixed by the sinus, opening all round the 

 margin. Sori mostly on the back of the veins. 



XX. Nephrolepis, Schott. Indusium reniform, fixed at the 

 sinus or at the arcuate base, opening toward*the margin of the 

 frond. Sori at the end of free veins. 



r\ Indusia fixed by a broad base partly under the sorus. 



XXI. Cystopteris, Bernh. Indusium convex, usually reflexed 

 as the sporangia ripen. Texture delicate. 



\\\Indusia obscure. Fertile frond much contracted, very unlike 

 the sterile. 



XXII. Onoclea, L. Sori dorsal on the veins of the contracted 

 pinnas, concealed by their revolute margins. 



'^^'^■^ Indusia inferior. 



XXIII. Woodsia, R. Br. Indusium roundish or stellate, deli- 

 cate, cleft into irregular lobes. 



