Identification and symbiotic ability of Psathyrellaceae fungi isolated from a photosynthetic orchid, <i>Cremastra appendiculata</i> (Orchidaceae)

This report is the first of a mycorrhizal symbiosis between a fungus in Psathyrellaceae and a photosynthetic orchid, revealing a new pathway to full mycoheterotrophy and contributing to our understanding of the evolution of mycoheterotrophy.