The zoospore attaches itself by producing rhizoids that will grow into the substrate and anchor it. As the cell feeds on the host, growth of the cytoplasm and numerous mitotic divisions will occur, and a cell wall will form around the original zoospore membrane. The cell wall grows as the protoplasm increases in volume. The enlarged cell becomes the zoosporangium and cleaveage of the protoplasm will produce the individual zoospores that are released through a predetermined pore. Blastocladiales Fungi in this order are more complex than the previous order.
True mycelium is produced, which is coenocytic.
Zoospore characteristic of Blastocladiales. We will examine Allomyces macrogynus , a well studied species which has been determined to have a true alternation of generations, i.e. a sporic life cycle, with a multicellular haploid and diploid thallus is produced during its life cycle. This type of life cycle is normally associated with plants and with respect to fungi is only known to occur in this order. Although not typical, more than a pair of gametangia may occur on each apex of the gametothallus. Thus, this is an example of an anisogamous species.