I. Features
    Named because zygospore is produced, resulting from fusion of gametangia. Mostly terrestrial saprophytes - some parasitic.

II. Examples.

A.  Rhizopus stolonifera
   Mycelium grown on substrate of various types of organic matter- (yams, bread). Eventually a mass of aerial hyphae will be formed. Once this mycelial mass is well formed, reproduction may occur.
1. Asexual Reproduction
   Rather large hyphae grow just above the substrate, then reestablish contact, at which points new hyphae will develop. These large transverse hyphae are stolons. They are anchored to the substrate by rhizoids, and vertical hyphae - the sporangiophores develop. The tip of the sporangiophore swells, and a cell wall develops to separate the developing sporangium from the sporangiophore. The cross-wall forms a dome inside the sporangium, & this dome - the columella - is the sporogenous zone.
2. Sexual Reproduction
  Short hyphal branches of different mating strains swell & come in contact. A cross wall develops across the tip of each hypha forming gametangia. The rest of the short hypha is now a suspensor. The cell wall between the two gametangia dissolves, & the protoplasts unite, forming a zygote. A zygospore is now formed. Germination of the zygospore begins with meiosis. A short hypha and a sporangium are then formed, & the resulting spores are dispersed, to begin he development of new mycelia.
B. Pilobolus - a dung fungus - the fungal cannon. Literally shoots the sticky walled sporangium towards the light.
C. Entomophthora muscae - attacks insects - kills them, then discharges spores in a manner like Pilobolus.

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