sap·ro·phyte /ˈsæprəˌfaɪt/

any organism that lives on dead organic matter, as certain fungi and bacteria.

Also called saprobe.

1870–75; sapro- + -phyte

—Related forms
sap·ro·phyt·ic  /ˌsæprəˈfɪtɪk/ Show Spelled, adjective

Sellars dropped back into his system and called up his metaphorical Garden … A strange blight had overtaken the Garden. Whole plants were gone, entire sections of stored information corrupted or interdicted. Other information sources had taken on strange new shapes. The saprophytic growth that represented the mysterious operating system had mutated out of all recognition …
Source: Mountain of Black Glass by Tad Williams.