Source : Webster's Revised Unabridged Dictionary (1913)

Hymenomycetes \Hy`me*no*my*ce"tes\, n. pl. [NL., fr. Gr. ? a
   membrane + ?, ?, a mushroom.] (Bot.)
   One of the great divisions of fungi, containing those species
   in which the hymenium is completely exposed. --M. J. Berkley.

Source : WordNet®

Hymenomycetes
     n : used in some classifications; usually coextensive with order
         Agaricales: mushrooms; toadstools; agarics; bracket fungi
         [syn: {class Hymenomycetes}]