A Pictorial Atlas of Fossil Remains, consisting of coloured illustrations selected from Parkinson's "Organic remains of a former world," and Artis's "Antediluvian phytology."

by Gideon Algernon Mantell

6. Sigillaria.—Stem channelled, not jointed; impressions in the form of disks, arranged
in quincunx.

7. Clathraria.—Stem neither channelled, nor jointed; impressions in the form of rounded disks, disposed in quincunx.[97]

8. Sagenaria.—Stem without joints, or furrows, covered with conical rhomboidal tubercles disposed in quincunx, having at their upper extremity an impression in the form of a disk.[98]

9. Stigmaria.—Stem without joints, or furrows; impressions rounded, distant, disposed in quincunx.[99]

[94] These stems appear to M. Brongniart to belong to the arborescent grasses, to Calamus or its allied genera.

[95] M. de Candolle suggested to M. Brongniart that these stems belong to some plants of the natural order of Equisetaceæ.

[96] M. Brongniart considers these remains to belong to genera which are entirely extinct.

[97] M. Brongniart shows in his paper the great agreement between these two genera, and the stems of ferns, in every respect excepting magnitude, and considers them as evidently owing their origin to plants of that natural order rather than to the palms.

[98] The stems of this genus are referable, in the opinion of M. Brongniart, to those of plants belonging to the family of Lycopodiaceæ, notwithstanding the great difference of size between them and those of the recent plants of that natural order.