Abstract
From the fronds of Polystichum tripteron (KUNZE) PR. a new norcarotenoid glycoside was isolated and shown to be (6R, 7E, 9R)-9-hydroxy-megastigma-4, 7-dien-3-one-9-O-β-D-glucoside. The fronds of Dennstaedtia wilfordii (MOORE) CHRIST. contain the same glucoside.