408 99. FILICES. 
Suborder IV. OPHIOGLOSSACEZ. 
Vernation straight. Rachis succulent. Thece regularly 2- 
valved, sessile, in clusters on a separate branch of the frond. 
Tr. VII. OPHIOGLOSSE. 
17. Borrycutum. Thece distinct, disposed in a compound 
spike attached to a pmnate or bipinnate frond. 
18. OpHrocLossum. Thece connate, disposed in a simple 
distichous spike attached to an undivided frond. 
Suborder I. Polypodiacee. Tribe J. Polypodiee. 
1. ALLosorus Bernh. 
1. A. crispus (Bernh.); barren fronds 2—3-pinnate, leaflets 
wedgeshaped or linear-oblong often bifid at the end, leaflets of 
the fertile fronds oblong.—N. 103. Pteris Sm., E. B. 1160. 
Cryptogramma R. Br., Hook.—Fertile frond nearly triangular. 
Veins alternate, often forked and each branch terminating in a 
sorus without an indusium but concealed by the reflexed margins 
of the leaflet. Height 6—12 in. St. slender, very brittle — 
Stony places on mountains. P. VII. Rock Brakes. 
2. Pouyropium Linn. 
1. P. vulgare (L.); fronds deeply pinnatifid, lobes linear-ob- 
long somewhat serrated all parallel upper ones gradually smaller. 
—E, B.1149. N. 111.—Rhizome brown, densely scaly, creep- 
ing. Fronds strapshaped. Sori large, on the upper part of the 
frond. Lateral veins of the pmnz with 4 branches of which the 
lowest terminates in a sorus. Pinne occasionally bifid at the 
end, sometimes deeply serrate or even (P. cambricum L.) doubly 
pinnatifid.—On shady banks, walls and old trees. P. VIII—X. 
Common Polypody. 
2. P.? Phegopteris (L.); fronds pinnate, pinne linear-lanceo- 
late united at the base pinnatifid with linear-oblong blunt lobes, 
lowest pair of pinne turned downwards and forwards the rest 
upwards, sori marginal.— #. B. 2224. N.115.—Rhizome nearly 
black, wiry, slightly scaly, creeping extensively. Fronds trian- 
gular. Pine very acute, pointing upwards, rather hairy, con- 
nected by their whole width with the rachis; the lowest pair 
quite distinct, with a minute stalk, standing forwards and pomt- 
ing from the others. Lateral veins of the lobes simple, extend- 
ing to the margin.—Roth (Fi. Germ. iii. 73.) found an evanescent 
indusium, which no other person appears to have seen, and there- 
