[[File:Betaphycus gelatinus PROSEA.TIF|thumb|1, habit lower surface; 2, habit upper surface;<br>3, details of cystocarps growing from the lower surface<br>of a fertile thallus with reduced spines at the near margin;<br>4, details of a section through a spermatangial sorus;<br>5, details of a section through a tetrasporangial sorus with zonate tetrasporangia. ]]