Phycomycetes is an obsolete[1][2][3]polyphyletic taxon for certain fungi withaseptatehyphae.[4] It is used in theEngler system.[5] Asexual reproduction takes place by zoospores (motile) or by Aplanospores (non-motile). These spores are endogenously produced in sporangium. A zygospore is formed by fusion of two gametes. These gametes are similar in morphology (isogamous) or dissimilar (anisogamous oroogamous).
The class Phycomycetes has been abolished and in its place existsZygomycetes,Chytridiomycetes,Plasmodiophoromycetes,Hyphochytridiomycetes,Trichomycetes (includingHarpellales,Asellariales,Eccrinales andAmoebidiales) andOomycetes. Still, "Phycomycetes" can be used to refer to all the above-mentioned classes as a whole.
The members of this group are found in aquatic habitats and on decaying wood in moist and damp places or asobligate parasites on plants. Themycelium is aseptate andcoenocytic. Asexual reproduction byzoospore or byaplanospore. Azygospore is formed by the fusion of twogametes. Examples areMucor,Rhizopus,Albugo,Saprolegnia.
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