2. Favularia.—Stem furrowed, not branched, leaf-scars small, square, and as broad as the ridges of the stem.
3. Lepidodendron.—Stem not furrowed, branched, covered with lozenge-shaped scars in quincuncial order, each having a papilla in the upper part; the upper portion of the stem and branches with simple linear leaves; the lower portion destitute of leaves.
4. Halonia.—Stem not furrowed, branched, covered with indistinct rhomboidal marks, and tubercular projections disposed in quincunx.
5. Knorria.—Stem not furrowed, branched, marked with projecting scars of petioles disposed spirally.
6. Megaphyton.—Stem dotted, neither furrowed nor branched, leaf-scars very large, of a horse-shoe figure.[114]
[114] Pictorial Atlas, pl. xxv.
7. Bothrodendron.—Stem pitted, neither furrowed nor branched, scars of cones (?) obliquely oval.
8. Ulodendron.—Stem neither furrowed nor branched, covered with rhomboidal marks; scars of cones (?) circular.
The characters of the roots called Stigmariæ (ante, [p. 134].), and of the stems named Calamities (ante, [p. 107].), and Equisetites (ante, [p. 106].), are sufficiently distinct from the above to be easily recognized, I will briefly notice those not previously described.