Mycelium present; antheridia but no antherozoids; oogonia with one or more oospheres: Peronosporaceae, Saprolegniaceae.
They are reproduced by means of antheridia and oogonia developed in conceptacles, clustered together at the apex of the branches.
In the rotting tissues branches of the older mycelium similarly swell up and form antheridia and oogonia (fig. 4).
Sexual reproduction by oogonia and antheridia; asexual reproduction by zoospores or conidia.
These escape and float passively away when the wall of the oogonia ruptures.
De Bary has claimed for the oogonia in Cystopus and Peronospora a kind of fecundation which deserves mention here.
The Peronosporaceae reproduce themselves sexually by means of antheridia and oogonia as described in Pythium.
oogonium o·o·go·ni·um (ō'ə-gō'nē-əm)
n. pl. o·o·go·ni·ums or o·o·go·ni·a (-nē-ə)
The primitive egg mother cell from which the oocytes develop.