Refers to a mycorrhiza in which the mycelium forms an external covering on the root. 
Describes an organism that gets its nutrients from the outside surface of its host. ... (09 Oct 1997) ... 
Refers to a mycorrhiza in which the mycelium forms an external covering on the root (e.g. in pine).
ectotrophic 1. Refers to fungi that grow on the surface covering of roots. 2. Describes an organism that gets its nutrients from the outside surface of its host.