a prerequisite for the active, explosive ejection of ascospores from an ascus when its high cell turgor is released. A high cell wall extensibility is particularly required at the area of the apical pore-like opening (apical ring), through which the ascospores are pressed when the ascus bursts. See also Color reaction Iodine test References Mycology ru:Споровый порошок#Исследование на амилоидность