the term "maduromycetes" was introduced for a number of poorly circumscribed sporoactinomycetes in need of taxonomic revision. although maduromycetes were conceived as a natural group, they do have a number of chemical and morphological features in common.they are aerobic,gram-positive actinomycetes that form a branched substrate mycelium that does not carry spores but bears aerial hyphae that can differentiate either into short chains of arthrospores or into sporangia containing one to many spores