In the past, non-photosynthetic plants were thought to get food by breaking down organic matter like fungi do. Such plants were therefore called "saprophytes". That was wrong. It is now known that no plant is physiologically capable of direct breakdown of organic matter.
The interface between the plant and fungal partners in this association is between the roots of the plant and the mycelium of the fungus. Myco-heterotrophy therefore closely resembles mycorrhiza, and is thought to have evolved from mycorrhiza.
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