Calamites

a genus of wood thieves in the wedge leaf category, which appeared in the charcoal ii-stacking era and together with scales and seals, formed a tropical swamp forest in the northern hemisphere. This genus of plants looks very much like a modern wood thief. The stem is hollow, the myelin cavity is large, with rotating leaves and side branches born in the section, with underground stems. Tree-like, up to
20

30
meters. Stems up to
30
centimeters in diameter, with secondary wood. Stems with obvious sections and between sections, the surface of the inter-section with vertical ribs, vertical ditches, the vertical ribs between the two adjacent sections in the section interactive growth. The myelin mold, outer mold or pressure fossils of stems are called reed wood, according to the volume of the plant body and the growth of side branches can be divided into
4
sub-genus, that is, the branch reed wood, column reed wood, cross reed wood and ring reed wood. The stems that hold the cellular structure are called reeds and thymus, respectively. The leaves of reed wood are single leaves with a middle vein, generally needle-shaped or wire-shaped, wheeled in the branches of stems and side branches;the spores of reeds, like modern wood thieves, are shield-like, called spore sacs, each with
4
spore sacs, many of which are integrated with spore leaf balls. On the spore leaf ball, the spore shank imperist wheel interacts with the infertile shrapder wheel and is shaped in a variety of ways. Different types are recorded in different forms, such as the genus of reed spores, the genus of ancient reeds, etc. Spores are more ynogeneic and less shaped.