A small fungus or fungus-like structure; a diminutive or rudimentary fungal form.
From Latin fungus + -illus (diminutive suffix), literally 'a small fungus.' This Latin-derived noun appears in scientific nomenclature and historical biological texts from the 17th and 18th centuries.
In early mycology, naturalists used 'fungillus' to describe the tiniest visible fungi and fungal structures, though modern microscopy has revealed that what they thought were tiny fungi are often just spores or hyphal fragments.
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