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Microsorum grossum at the base of a Caryota mitis palm along a lightly landscaped nature trail on the fringes of exotic-dominated secondary forest. The only clump of this fern in the area, and likely an escape from cultivation or an accidental planting.

• fronds with 5-10 pairs of lobes ((4-)5-8½ in this specimen)
• plant terrestrial
• rhizome robust, fleshy, ≥5 mm diam., not white-waxy
• rhizome scales clathrate, ovate, pale- to mid-brown, apex not long-acuminate
• anecdotally widespread in cultivation and under-recorded in Asia due to confusion with M. scolopendria, largely due to their being lumped in Flora Malesiana

ID is slightly tentative in case there are obscure species/hybrids closely resembling M. grossum that I haven't found out about.

Previously observed in August 2023: https://www.inaturalist.org/observations/176807887

See:
McCarthy, P.M. 1998: Ferns, Gymnosperms and allied groups. Flora of Australia. Vol. 48. ABRS/CSIRO, Canberra and Melbourne.