20. Isoetes = Stemless, quill-leaved, aquatic plants,
with the fructifications at the base, enclosed within
the bases of the leaves.
21. Pilularia = Creeping, slender-leaved, aquatic
plants, with the fructification in globular, sessile,
four-celled spore-cases.
IV. HOESBTAILS—
Flowerless plants, with peltate spore-cases, arranged in
terminal cones. This group consists of the genus
22. Equisetum— iomioA, tubular-stemmed plants, with
terminal cones of fructification.
A TABLE OE THE SPECIES AND VARIETIES OE BRITISH
FERNS, &c.
I. FILICES.
PoLYPODiACE^ § P o ly p o d ie s.
i- Polypodium, Idnnceus.
^ Eronds pinnatifid. Plate I.
b. cambricum.-Eronds twice pinnatifid.
. • K^gopteris, linnatus. ~ Fronds sub-pinnate,
rlate II. fig. 2.
‘“ -t--. gLbrous.
4. I - » 1 ^ ™ « . - F r o n d s tem.te, glandotamealy.
Plate H I. fig. i .
ii. A llo so ru s , Benhardi.
1. A. crispus, Bernhardi.~TBo only species. Plate V
%• 1.
-8. POLYPODIACES § AsPIDIES.
iii. V'ooDsiA, B. Brown.
h.ll
i J|
1
