410 CLASS XXIV. ORDER I. 



summit; indnsium (or veil) squamiform, covering 

 each capsule. 



424. OsMUNDA. Capsules subglobose, pedicellate, 

 striate, scmibivalvular and paniculated; indusium 

 none. 



425. PoLYPODiuM. Sori (or small clusters of cap- 

 sules) roundish, scattered ; indusium none. 



426. WooDSL'V. ?>ori roundish, scattered; indusium 

 calyciform, open, with a hairy margin, including the 

 pedicellate capsules. 



427. AspiDiuBi. Sori roundish scattered ; indusium 

 umbilicate or opening on one side. 



428. Onoclea. Capsules densely covering the back 

 of the frond ; indusia squamiform, connate in the form 

 of berries and not expanding. 



429. Struthiopteris. Capsules densely covering 

 the back of the frond ; indusia squamiform, marginal, 

 opening internally. 



430. AsPLENiuM. Sori linear, transversal, scatter- 

 ed ; indusia arising from the lateral veins, and open- 

 ing towards the rib. 



431. Pteris. Sori continuous, linear, marginal; 

 indusium from the inflected margin of the frond, 

 opening inwards. 



432. WoonwARDiA. Sori oblong, distinct, straight, 

 parallel with the ribs of the frond on either side ; in- 

 dusia superficial, arched, opening inwards. 



433. Adiantum. Sori oblong or roundish ; indusia 

 membranaceous, arising from the margin of the frond 

 and opening inwards. 



434. Dicksonia. Sori punctiform, marginal, round- 

 ish, and distinct; indusium double, one superficial, 



