meaning of Blauer Krustenschwamm

Blauer Krustenschwamm - German to English

blue encrusting sponge [Terpios gelatinosa, syn.: Hymeniacidon coerulea, H. gelatinosa, Laxosuberites coerulea, Suberites tenuiculus, Terpios coerulea, T. tenuiculus]