n 1  cap  :  a genus of sheathed filamentous bacteria of uncertain taxonomic affiliation that are unbranched or exhibit false branching and have the sheath encrusted with ferric hydroxide - see LEPTOTRICHIA   2  pl  lep*to*trich*ia  also  lep*tot*ri*ches   :  any bacterium of the genus Leptothrix .
 
 
 
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