Gymnosphaera acrostichoides is a species of tree fern found in forests of eastern Indonesia and Papua New Guinea.
The trunk is erect and usually 1mto3mm (03feetto10feetm) tall. Fronds are bipinnate and 1mto2mm (03feetto07feetm) long. The stipe is slender and covered with spines. It is sparsely covered with medium brown scales. Sori cover most of the underside of fertile pinnules. G. acrostichoides lacks indusia.
Gymnosphaera acrostichoides is native to the Maluku Islands and New Guinea, where it grows in forest and disturbed sites at an elevation of 60mto1830mm (200feetto6,000feetm).