The Collaborative International Dictionary of English v.0.48:

Mycology \My*col"o*gy\, n. [Gr. my`khs fungus + -logy.]
   That branch of botanical science which relates to the
   mushrooms and other fungi.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mycology
    n 1: the branch of botany that studies fungi and fungus-caused
         diseases

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "mycology":
   algology, aquiculture, botany, bryology, dendrology, fungology,
   hydroponics, paleobotany, phycology, physiological botany,
   phytobiology, phytochemistry, phytoecology, phytogeography,
   phytography, phytology, phytomorphology, phytonomy,
   phytopaleontology, phytopathology, phytotaxonomy, phytoteratology,
   phytotomy, phytotopography, plant anatomy, plant pathology,
   plant physiology, pomology, structural botany, systematic botany