Detail:In stages Ill to IV, Stage Ill Spore septum grows around protoplast (engulfment) Forespore 孢子隔膜环原生质体生长 formation Core Outer spore membrane Inner spore- Exosporium appears;primordial membrane cortex is formed between the two membranes Stage IV 形成芽胞外壁，原始皮层 在两层膜间形成 Dehydration ) Primordial cortex- Exosporium
Detail: In stages III to IV, 孢子隔膜环原生质体生长 形成芽胞外壁, 原始皮层 在两层膜间形成
Detail:In stages V to Vll Free spore Exosporium Core Stage VIl Lysis of cell and release 细胞的裂解 of free spore 所有的芽胞衣层形成 Coat layers are formed Stage VI Cortical layers Stage V Maturation (development of 芽胞成熟， resistance to heat and chemicals)
Detail: In stages V to VII 所有的芽胞衣层形成 芽胞成熟, 细胞的裂解