The Collaborative International Dictionary of English v.0.48:
mycoderma \my`co*der"ma\, n. [NL., from Gr. my`khs a fungus +
1. (Biol.) One of the forms in which bacteria group
themselves; a more or less thick layer of motionless but
living bacteria, formed by the bacteria uniting on the
surface of the fluid in which they are developed. This
production differs from the zoogloea stage of bacteria by
not having the intermediary mucous substance.
2. (Capitalized) A genus of microorganisms of which the
acetic ferment (Mycoderma aceti), which converts
alcoholic fluids into vinegar, is a representative. Cf.
[1913 Webster] Mycologic