Acervulus

acervuli) is a small asexual fruiting body that erupts through the epidermis of host plants parasitised by mitosporic fungi of the form order Melanconiales (Deuteromycota, Coelomycetes).

It has the form of a small cushion at the bottom of which short crowded conidiophores are formed.

The spores escape through an opening at the top.

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Acervulus morphology.
cu : cuticle, co : conidium, cf : conidiophore, ps : pseudo-parenchymatic stroma, hi : hypha.