Aptly named the Narrow-leaf Bird’s Nest Fern, this epiphyte or lithophyte is restricted to rainforests and does not seem to be as common as the larger A. nidus or A. australasicum. However, it is always a pleasure to spot this fern and it makes for a beautiful ornamental plant to grown in shaded gardens.
Like the two other related bird nest fern Aspleniums, the fronds of this fern are simple and the sori (the spore-bearing structures) are linear and slit-like and stretches from the midrib to near the leaf margin.
See iNaturalist observation:
https://www.inaturalist.org/observations/47249660
Leaf Whispering in the Tropics 