Cyathea mertensiana

Maruhachi, scientific name:Cyathea mertensiana, is an evergreen large tree ferns of the Cyatheaceae department ,of Cyathea genus endemic to Ogasawara. Upright stem height is 5 ~ 10 meters or higher. Plant name has been named from the things that look like upside-down, "○" in Kanji "8"-shaped marks on the surface of the stem leaves have fallen. To the stem tip leaves the crowding to the coronary.

Generic name: Maruhachi,scientific name:Cyathea mertensiana, origin: Ogasawara Islands, environments: forest of sunny sward, height: 5-12 m, upright, leaf color: green, leaf blade length: 2 m
Petiole length: 30-70 cm, leaf shape: envelope membrane twice with pinnately compound leaves wrapped in deep lobed, margin: wavy, solus: brown ~ straw color, long, linear lanceolate.