The Collaborative International Dictionary of English v.0.48:

Mycose \My"cose\ (m[imac]"k[=o]s), n. [Gr. my`khs a mushroom.]
   (Chem.)
   A variety of sugar, isomeric with sucrose and obtained from
   certain lichens and fungi. Called also trehalose. [Written
   also mykose.]
   [1913 Webster]