622 
FILICES. (FERNS.) 
■*" Veins all free, none of them reticulated or anastomosing. 
++ Indusium inflated, fixed by half or all the margin. 
12. Cystopteris. Indusium hood-like, fixed on oue side by a broad 
base, opening on the other outwardly. 
13. Woodsia. Indusium globular, fixed by the whole margin, early 
bursting through the top or centre, and becoming cup-shaped. 
++ ++ Indusium flat or depressed, opening round the whole margin. 
^ e ins of the sterile frond finely reticulated. 
16. Onoclea. Fertile frond contracted, the divisions rolled up or 
even berry-like. Indusium hood-like, fixed by the inner edge. 
Suborder II. OSMUNDINEiE. (Flowering Fern Fam.) 
Sporangia variously collected, destitute of any proper ring, cellular- 
reticulated, opening lengthwise by a regular slit. 
* (SchizejE.) Sporangia oblong or oval, sessile, with a circular 
17 ® tr ^ ate -rayed portion at the apex, opening down the outer side. 
chizjEa. Indusium none : sporangia covering one side ot the 
Hnear pinnae of the naked and stalk-like fertile frond. 
ygodium. Indusia imbricated in 2 ranks on one side of the 
fertile lobes of the leafy climbing frond, sac-like. 
10* ^ >SMUND ®‘ 5: ) Sporangia globose, pedicelled, vertically 2-valved. 
smunda. Sporangia naked, covering contracted fropds. 
Suborder III. OPHIOGLOSSE^. (AdderVtongue Fam.) 
Sporangia spiked, closely sessile, naked, coriaceous and opaque, not 
reticulated, destitute of a ring, opening by a transverse slit into 2 
va ves, discharging the very copious spores which appear like floury 
dust. — Fronds straight, never rolled up in the bud ! 
20. Botrychium. Sporangia distinct, in compound or pinnate spikes. 
21. Ophioglossum. Sporangia cohering in a 2-ranked simple spike. 
1. POLYPODIlfM, L. Polypody. 
Fruit-dots round, naked, variously or irregularly scattered over 
the back of the flat and expanded leaf-like frond. Veins simple, 
forked or pinnate, free (not connected by cross branches or anas¬ 
tomosing). Rootstocks creeping, often covered with wool-like 
chaff, and with tufted branches (whence the name, from i roXv, 
many , and novs , foot). 
* Fronds simply and deeply pinnatifid, evergreen : fruit-dots large. 
1- VUlgfaxe, L. Fronds oblong , smooth , and green both 
