endophyte

endo- (“inside”) +‎ -phyte (“plant”)

endophyte (plural endophytes)

1. Any organism (generally a bacterium, fungus or alga) that lives inside a plant
   • 2020, Merlin Sheldrake, Entangled Life, page 157:

     Take a grass from salty coastal soils, grow it without its fungal endophytes, and it won't be able to survive in its natural salty habitat.

• entophyte

• endophytic

• endosymbiont