mesomycetes

from The Century Dictionary.

• A group of fungi including the Hemiascales and the Hemibasidiales, regarded by some authors as intermediate between the Phycomycetes and the higher fungi, Ascomycetes and Basidiomycetes.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Bot.) One of the three classes into which the fungi are divided in Brefeld's classification.