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The predatory fungus Arthrobotrys dactyloides as a two-celled conidium.  I placed the conidia in a well of liquid on a petri dish of nematodes.  They were induced to form constricting rings directly from the conidium as is seen here in the SEM.   With numerous conidia present, simultaneous ring formation caused the curving trap cells to interlock and produce the double ring you see here. Photo: Nancy Allin  

If you look carefully you will see that when  the curving  trap hypha meets the stalk that there is a DOUBLE anastomosis bridging the original septum of the stalk.  A  new septum now forms in the middle of the bridging loop to form a three-celled ring. CLEVER!  Think about it!