1. The trunk of a tree fern.

2. The trunk of a palm or tree fern.

3. Asiatic tree fern having dense matted hairs sometimes used as a styptic.

4. Caudex definition is - the stem of a palm or tree fern.

5. Adpressed tree-fern trunks from the Early Pennsylvanian Joggins Formation of Nova Scotia

6. The silver tree fern can grow to more than 30 feet (10 m) tall

7. Late Carboniferous Period (Pennsylvanian) 318-299 million years ago Among the giant plants in the Carboniferous forests were Cordaites, an early relative of conifers; Calamites, a bushy horsetail; Medullosa,a seed fern (a plant with seeds and fern-like leaves); Psaronius, a tree fern; and Paralycopodites and Lepidophloios, lycopsids (scaly, pole-like trees with cones).