No tetrasporangial phase is known. (Dixon  and Irvine 1977 p. 148) However tetraspores released from Rhododiscus pulcherrimus when cultured germinated to form spermitangial and carpogonial branches.
The absence of a tetrasporangium stage is noted in the reference, but tetraspores from *Rhododiscus pulcherrimus* can germinate into spermatangial and carpogonial branches when cultured.