papuana?
Edit to add spore size 7.5-8.5 x 5-5.6 µm
Spores too large for papuana, seems to fit section Zapotecorum, similar to aucklandii / aucklandiae
Growing solitary from ground in coastal forest. fragile, with slender stipe and reasonably dense gills. Somewhat conical cap. Uniform light fawn/brown color.
Growing on the trunks of tree ferns, photographed on black velvet.