It is not native. Not because it cannot survive here. Because it arrived from tropical regions and established itself in warm coastal areas. The ladder fern exists only in these marginal spaces, overlooked and undervalued until it disappears. The species inhabits rocky crevices and cliff faces in coastal and montane areas. It prefers shaded damp sites with minimal soil, anchoring itself with shallow roots in cracks and fissures. Unlike forest ferns that require deep leaf litter, this spleenwort thrives on bare rock where competition is low. Spores are produced on the underside of fertile fronds in linear sori along the veins. These spores are released into the air, drifting on wind currents until they land on suitable rocky substrate. Diet consists of nutrients obtained through photosynthesis and absorption from rainwater and rock weathering. The fern does not consume organic matter directly but rather extracts minerals from water trickling over rock surfaces. This lithophytic lifestyle allows it to thrive in nutrient-poor environments where other plants cannot establish. Classified as Introduced, ladder fern remains widespread in northern regions. Populations are stable in suitable rocky habitat. However the species is sensitive to habitat disturbance. When rock faces are modified for construction or quarrying, populations decline rapidly. Its presence signals intact geological features and suitable moisture levels. Conservation efforts focus on protecting remaining rocky outcrops from development and maintaining natural hydrological regimes.