Phylum zoospores. Sexual reproduction occurs by fusing

Phylum Chytridiomycota
encompasses most fungi, which at some point in their life cycles exists as flagellated
swimming cells and these fungi are therefore, primarily, found in aquatic
environments. These fungi reproduce asexually when
a zoospore lands on a substrate, followed by formation of a cell wall around it
– leading to creation of a fungi body. Long threads, rhizoids, attach to the substrate
and through these nutrients are absorbed. After a period of feeding, the fungi
body is converted into a sporangium, a structure which contains and
subsequently releases zoospores. Sexual reproduction occurs by fusing zoospores,
thus creating a diploid zoospore, which then hardens and creates a
meiosporangium. Later fusing of nuclei create meiospores, which can then swim
away and form a new fungi body. Fungi of this phyla are mostly harmless,
saprotrophic fungi, although a few pathogens such as Batrachochytrium dendrobatidis, which causes chytridiomycosis in amphibious animals
have been found.

Phylum Zygomycota clusters more than 1100 different species, mostly
saprotrophic soil fungi, who exploits nutrients by decomposing waste products,
such as rotten fruit. Their name, refers to their reproductive sexual
mechanism, as it forms a structure called zygosporangium, arising from the
conjugation between two compatible hyphae, with each hyphae stemming from a separate
organism.  After conjugation, a cell wall
is formed behind the fusing hyphae, which at this point are called gametangia.
Next to this, the wall separating the two hyphae is broken down, leading to
fusion of both hyphae’s cell components into one organism, except their nuclei,
which are still separate entities. Following this, their nuclei fuse and the
walls around the zygosporangium grows even harder and thicker than before – this
converts the sporangium to a zygospore. After a long resting period, meiosis occurs,
and the fused nuclei are divided into two separate recombinant nuclei.  These are then later integrated and released
as meiospores. Most Zygomycota are harmless to humans, although a few are
pathological causing a disease called mucormycose,
which arises when spores are inhaled from dusty environments.  

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