A primitive or partially-developed club-shaped fungal structure that produces spores, representing an evolutionary intermediate form between simpler fungi and the true basidia of advanced fungi.
From Greek 'hemi-' (half) plus Latin 'basidium' (small base, from Latin 'basis'). The term was coined in late 19th-century mycology to classify fungi with atypical spore-producing organs.
Under a microscope, a hemibasidium looks like nature's draft of what a basidium could be—it hints at evolution trying different designs for making spores until it landed on the efficient, club-shaped basidium we see in mushrooms today.
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