78 NATURAL ORDERS AND 
ORDER CIV. LYCOPODIACEZ.—De Canp. 
Usually moss-like plants. Stems creeping, solid, vascular, or stem- 
less. eaves imbricated, mostly erect and subulate, the axis abound- 
ing in annular ducts. /ructification sessile, thece in the axis of the 
leaves, or bracts, and then formed into a spike, theew either bursting 
by distinct valves or indehiscent, and containing either minute 
powdery matter or sporules, marked at the apex with three minute 
radiating elevated ridges, 
GENERA. 
Thecze two or three valved, the former 
containing fine powdery matter, the 
latter a few large sporules.. ............. LycopopruM, v. 4. 
ORDER CV. MARSILEACEA.—Brown. 
Creeping plants. Leaves petiolate and divided (or petioles destitute 
of lamine), rolled up in vernation. Fructification inclosed in leathery 
involucres that are near the root of the plant, and contain the thece 
(or conceptacles), which are of two kinds, one consisting of membra 
nous sacs, moist and tumid, containing germinating sporules, the 
others membranous sacs, containing a gelatinous matter and nume- 
rous powdery grains. 
GENERA. 
Conceptacles enveloped by involucre, 
formed by the dilated base of the 
HEA CR ccecenssosne Scsoeesecs eras taeetesveecs: LAORTES? Viawte 
Conceptacles naked, axillary ............06 PILULARIA, V. 4. 
ORDER CVI. EQUISETACEA.—De Canp. 
Fructifications terminal, in cone-like spikes or catkins, consisting of 
peltate scales, on the underside of which are from four to seven 
involucres, which open longitudinally, and contain numerous globose 
bodies, enfolded by four filaments, club-shaped, and at their extre- 
mity highly hygrometrical—Rigid leafless branched plants, with 
striated fistulose stem and branches, in the cuticle of which silex is 
secreted, numerously jointed, with sheathing toothed articulations. 
GENERA. 
The only genus of the order.........++ sseeee EQUISETUM, V. 4. 
ORDER CVIL. MUSCI.—Juss. 
Fructification of two kinds. Awillary bodies cylindrical, or fusiform 
sacs in the axis of the leaves, containing a multitude of spherical or 
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