Sentence:  Two absorptions of * * f with ethyl acetate or two absorptions of * * f ( which had been passed through Dowex-2-chloride ) , NS and * * f with <WSD>crown</WSD> gall tissue powder , or mouse liver powder did not further improve the specificity of staining . 
Meaning of the word marked with <WSD> tags:  a bacterial disease of plants (especially pome and stone fruits and grapes and roses) which forms excrescences on the stem near the ground