Spiny. exhook。 ) R.M. Tryon (scientific name), alias Shemu, is a fern belonging to the genus Alsophila of Alsophila, and is known as the "king of ferns". Alsophila spinulosa is a fern that can grow into a big tree, also known as "tree fern". The spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny spiny. It is the only woody fern found at present, which is extremely precious and can be called a national treasure. Endangered plants listed as first-class protection by many countries are called "living fossils". Alsophila spinulosa is an ancient fern, which can be made into handicrafts and traditional Chinese medicine, and is also a good ornamental tree species in gardens.

Alsophila spinulosa is one of the few woody plants. Born in the shade of forests or streams, it is found in Chishui, Guizhou, Tibet, Chinese mainland and southern China, and also distributed in Nepal, Sikkim, India, Bhutan, India, Myanmar, Thailand, Vietnam, the Philippines and southern Japan.