it may be alsophila spinulosa (wall. exhook.) R.M. tryon, also known as snake wood, which is a fern of Alsophila. Alsophila spinulosa is a fern that can grow into a big tree, also known as "tree fern". The spinulosa spinulosa stems are upright and hollow, like a pen container, and the leaves are spirally arranged at the top of the stems. It is the only woody fern that has been found, which is extremely precious and can be called a national treasure. It is listed as an endangered plant under first-class protection by many countries and is called a "living fossil". Alsophila spinulosa is an ancient fern, which can be made into handicrafts and traditional Chinese medicine, and it is also a good ornamental tree in the garden.