We don't have synonyms for mycoderm yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are mesoderm, hypoderm and mycoderma.
(n) :
Alternative form of mycoderma. [(archaic, biology, zymurgy, countable, uncountable) One of the forms in which microbes group themselves; a (microscopic or macroscopic) layer of motionless but living microbes united on the surface of the fluid in which they are developed, differing from the zoogloea stage by not having the intermediate mucous substance.]
(n) :
Alternative form of mycoderma. [(archaic, biology, zymurgy, countable, uncountable) One of the forms in which microbes group themselves; a (microscopic or macroscopic) layer of motionless but living microbes united on the surface of the fluid in which they are developed, differing from the zoogloea stage by not having the intermediate mucous substance.]