Abacopteris macrophylla

Abacopteris macrophylla is a large-leaved fern species in the family Thelypteridaceae, with the specific epithet macrophylla derived from the Greek makros (large) and phyllon (leaf), indicating that this species produces notably large fronds relative to other members of the genus. Large frond size is an adaptation commonly observed in understory ferns growing in deep shade, where an increased photosynthetic surface area compensates for the low light availability beneath a closed forest canopy. Abacopteris macrophylla grows as a terrestrial fern in humid tropical and subtropical forests, producing fronds from a creeping or ascending rhizome embedded in moist, organic-rich soil. The large blade is pinnate to bipinnate, divided into numerous broad, elongated pinnae that may exceed the dimensions typical of related species. Each pinna bears lobes or pinnules with visible venation on the lower surface, where sori are arranged in rows along the veins, typically protected by kidney-shaped indusia. The stipe can be substantial in proportion to the blade, supporting the weight of the large fronds, and is clothed in scales near the base and scattered hairs along its length. The rachis and costa often bear hairs that may be visible to the naked eye, contributing to the diagnostic features of the species. Abacopteris macrophylla likely occurs in lowland to montane tropical forests of Asia or Africa, where it inhabits forest understory in areas with consistently high rainfall and humidity. Its large fronds provide significant ground cover and contribute to moisture retention in the forest floor ecosystem.