Production of Spores in Phycomycetes
Phycomycetes produce both asexual and sexual spores as part of their reproductive cycle. These spores can be produced either exogenously or endogenously, depending on the species.

Exogenous Spore Production
Exogenous spore production refers to the formation of spores on the outside of specialized structures called sporangia. In phycomycetes, asexual spores known as sporangiospores are typically produced exogenously. These sporangiospores are formed within sporangia, which are sac-like structures that contain the spores. Once mature, the sporangium bursts open, releasing the spores into the environment.

Endogenous Spore Production
Endogenous spore production, on the other hand, involves the formation of spores within specialized structures inside the fungal mycelium. In phycomycetes, sexual spores such as zygospores are often produced endogenously. Zygospores are formed through the fusion of specialized sexual structures called gametangia. These structures are formed within the mycelium and eventually give rise to zygospores, which are thick-walled resting spores that can survive harsh environmental conditions.
In conclusion, phycomycetes exhibit both exogenous and endogenous spore production depending on the type of spore being produced. Asexual sporangiospores are typically produced exogenously within sporangia, while sexual zygospores are formed endogenously within the mycelium.