Definition
A perithecium (pl. perithecia) is a flask-shaped or subglobose, thin-walled fungus fruiting body (ascocarp) containing asci and ascospores; spores are expelled or released through a pore (ostiole) at the apex.
Perithecium of the fungal plant pathogen Glomerella (stained), embedded in host plant tissue. Spores are visible inside this flask-shaped structure. |
 Perithecia (orange colored) of the fungal plant pathogen Calonectria fruiting on host plant tissue. |
A perithecium (pl. perithecia) is a flask-shaped or subglobose, thin-walled fungus fruiting body (ascocarp) containing asci and ascospores; spores are expelled or released through a pore (ostiole) at the apex.