{"thcode":2,"term":{"code":1366,"name":"periphyton","parent":1266,"scope":"A plant assemblage including microbial communities of algae and cyanobacteria living attached to submerged aquatic vegetation."},"uf":[],"bt":[{"code":1266,"name":"vegetation","parent":841,"scope":"Plant life or general plant cover in an area."},{"code":841,"name":"organism groupings (non-taxonomic)","parent":1174,"scope":"Used for categories of living organisms that are not taxonomic and that include species from more than one taxonomic group."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[],"rt":[{"code":29,"name":"algae","parent":843,"scope":"Chlorophyll-bearing primarily aquatic nonvascular species that have no true roots, stems, or leaves; most algae are microscopic, but some species can be as large as vascular plants."}]}