Alsophila rosenstockii, synonym Cyathea ascendens, is a species of tree fern native to northeastern New Guinea, where it grows in rain forest at an altitude of . The erect trunk is slim and  tall.
The Alsophila rosenstockii, or Cyathea ascendens, is a type of tree fern found in the rainforests of northeastern New Guinea. It grows at high altitudes and has a slender, upright trunk that reaches great heights.