(n.) A fossil plant of the coal formation, having the general form of plants of the modern Equiseta (the Horsetail or Scouring Rush family) but sometimes attaining the height of trees, and having the stem more or less woody within. See Asterophyllite.

Calamites Cycadofilicales Filicales Selaginellaceae Sigillaria algae autophyte bean bracken brown algae calamite climber conferva confervoid creeper cycadofilicales diatom equisetum filicoids fruits and vegetables fucus fungus grapevine green algae gulfweed herb heterophyte ivy kelp legume lentil lepidodendrids lepidodendroids liana lichen liverwort mold moss mushroom parasite parasitic plant pea perthophyte phytoplankton planktonic algae plant families puffball pulse red algae rockweed rust saprophyte sargasso sargassum sea lentil sea moss sea wrack seaweed smut succulent toadstool vetch vine wort wrack