16. Poacites.—Leaves linear; ribs parallel.
17. Palmacites.—Leaves fan-shape.
[100] M. Brongniart considers these to belong to some extinct genus of plants, allied to, although perfectly distinct from, the recent genus Marsilea.
[101] These the author thinks are the remains of an extinct genus of plants.
[102] The character of the ribs here given belongs exclusively to leaves of plants of the dicotyledonous tribe; as those of the next genus Poacites equally restricts them to the other great tribe of monocotyledonous plants.
Class IV. Organs of fructification.
Order I. Carpolithes.—Fruits or seeds.
Order II. Antholithes.—Flowers.[103]
[103] These orders are too little known to be divided at present into genera.
The numerous additions and modifications, which subsequent experience and discoveries have led M. Brongniart to introduce into his classification, will be found in an article recently published (1849) in the "Dictionnaire Universel d'Histoire Naturelle," under the title of "Tableau des Genres de Végétaux Fossiles, considérés sous le point de vue de leur classification botanique et de leur distribution géologique."