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苏铁蕨(Brainia insigriis)是乌毛蕨科苏铁蕨属植物。植株高可达1.2米,根状茎木质,粗短、直立,有圆柱形的主轴,密生红棕色长钻形鳞片。叶多数,簇生于主轴顶部,叶柄长6～20厘米,叶片长60～100厘米,宽10～30厘米,一回羽状复叶,小羽片条状披针形,长10～15厘米,宽10～13厘米,渐尖头,叶片革质。叶脉网状,孢子囊沿最初网脉生长,以后向外布满叶脉全部,孢子囊无盖。因其茎叶极似苏铁,故名。
The brain fern (Brainia insigriis) is a black fern fern Supraceae. Plants up to 1.2 meters, rhizome woody, stout, erect, with a cylindrical spindle, densely reddish brown long diamond scales. The majority of leaves, clustered in the top of the spindle, petiole 6 to 20 cm long, leaves 60 to 100 cm long and 10 to 30 cm wide, a pinnate leaves, small feather strip lanceolate, 10 to 15 cm long, wide 10 ~ 13 cm, acuminate, leaf blade leathery. Veins veins, sporangia along the initial network vein growth, veins covered with veins after all, sporangia without cover. Because of its stems and leaves resemble cycads, hence the name.