418 
99. FILICES. 
E. Wilsoni (Newm. 39. S. 10.) is probably a large form. — jS. are- 
narhtm ; St. prociuabent, usually more slender, teeth of the 
sheaths wedgeshaped. E. variegatum Sm., E. B. 1987. S. 11. — 
Wet places, or in water, fi. Sandy places near the sea, P. 
vn. vm. E. s. 1. 
Order XCIX. FILICES. 
Leafy plants with a rhizome or trunk. L. or fronds circinate 
when young (Tribe ^11. excepted), simple or di^-ided. Fruc- 
tification springing fi'om the veins on the under side or at the 
edge of the 1., of l-celled capsules (thecse) which are stalked 
and have an elastic ring or sessile and without a ring. 
* Capsules with an elastic- marginal ring. 
Suborder I. POLYPODL\CE.iC. 
Capsules in dorsal or marginal clusters, opening transversely 
or irregularly. Young fronds circinate. 
t Clusters dorsal. Ming vertical, nsiially incomplete. Cap.s. 
opening transversely. 
Tribe I. POLYPODIES. Clustere nearly circular, without 
an indusium, seated upon the back of the lateral veins. 
1. CRTPTOGRAjniE. Clusters circular, at length confluent, 
concealed by the reflexed margin of the frond. — Barren and 
fertile fronds dissimilar. 
2. PoLYPODiiTM. Clusters circular, naked ; edge of the frond 
flat, not reflexed. 
3. WooDSL\. Clusters circular, with an inferior involucre 
divided at the edges into many capillary segments. 
Tr. II. ASPIDIEjE. Clusters nearly circular, covered by an 
indusiimi, seated upon the back of the lateral veins. 
4. Lasthea. Indusium reniform, attached by the notch. 
Veins distinct after leaving the midrib, not uniting with 
those of the adjoining lobe. 
5. PoLYSTiCHTM. Indusium circular, attached by the centre. 
Veins distinct after leaving the midrib. 
6. Cystopteris. Indusium attached by its broad hoode<l 
base imder the clusters, with a long fringed free extremity 
at first covering the capsules. 
