acervulus

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acervulus

[ə′sər·vyə·ləs]
(mycology)
A cushion- or disk-shaped mass of hyphae, peculiar to the Melanconiales, on which there are dense aggregates of conidiophores.
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Acervuli formed after 20 days on PDA, whereas acervuli formed within 10 days when autoclaved carnation leaves were added to the PDA.
Acervuli with exuding black masses of conidia (Figure 1-B) were observed at the margins of the cankers.
Histological studies also revealed hyphae growing between epithelial cells to establish spore-bearing, subcuticular, acervuli.
Acervuli (the reproductive structures) are formed once the cortical tissue has experienced moderate disruption and begins with the development of a stroma in the tips of the epidermal cells.