Having the form or appearance of an aecidium; shaped like or resembling a fungal spore-producing cup or pycnium.
From aecidium + -form (Latin -formis, meaning 'having the form of'). This morphological descriptor was used by mycologists to classify fungal structures based on their visible appearance under early microscopes.
Before DNA sequencing, mycologists had to be incredibly skilled at identifying fungi by their appearance—spotting whether a fungal structure was aecidiiform versus other forms was like being a detective reading crime scene evidence from plant leaves.
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