Glycoside hydrolase that may be involved in ulvan degradation (Probable). Ulvan is the main polysaccharide component of the Ulvales (green seaweed) cell wall. It is composed of disaccharide building blocks comprising 3-sulfated rhamnose (Rha3S) linked to D-glucuronic acid (GlcA), L-iduronic acid (IduA), or D-xylose (Xyl) (Probable). a beta-D-glucuronoside + H2O = an alcohol + D-glucuronate By ulvan and rhamnose. Belongs to the glycosyl hydrolase 2 family. Truncated N-terminus.