180 Brongniart, Sux les Vegetaux Fossiles. 
Genera. 1. Culmites. Stems articulated smooth, only one 
impression at each articulation. They sometimes. want 
this impression, but have then many cicatrices on the in- 
ternodes. They are considered analogous to the grasses 
and the jast variety to the creeping roots of grasses. The 
are found only in the coarse limestone ef the superior sedi- 
ment near Paris, 
2. Calamites. Stems articulated, regularly striated, im- 
pressions rounded small numerous, forming a ring aroun 
red to the Genus Equisetum, to which they are at least anal- 
ogous, although arborescent in size. They are found only 
in the coal formations, and in the copper mines of Catha- 
rineburgh. 
3. Syringodendron. Stems channelled not articulated, im- 
pressions punctiform or linear, disposed in a quincunx. 
They cannot be satisfactorily allied to any known plants. 
Found only in the coal formations 
4, Sigillaria, Stems channelled, not articulated, impres- 
sions in the form of a disc disposed in a quincunx. 
5. Clathraria. Stems neither channeled nor articulated, 
impressions in the form of rounded dises disposed in a quin- 
cupx. 
ese two Genera are referred to the Arborescent 
ferns—found only in the coal formations. 
6. Sagenaria. Stems neither channeled nor articulated, 
covered with rhomboidal conic tubercles, disposed in a 
quincunx, bearing at their summit an impression in the 
rm of a disc, 
These are referred to the Lycopodia, although arbores- 
cent. Found only in the coal formations. 
4s Stigmaria. Stems neither channeled, nor articulated, 
impressions rounded, far apart, disposed in a quincunx.— 
Their analogy is doubtful, but considered nearest to the ar- 
borescent Aroide, viz. the Dracontia, Pothos, &c. Found 
rineburgh, __ 
Class III. Stems and leaves united, or leaves insulated. 
Genera. 1. Lycopodites. Leaves linear or setaceous, 
und the stem or on two rows. There are four very dis- 
rour | ry 
tinct sections. 1. Leaves narrow, lanceolate, inserted all 
