--> Zoosporangium has double "oo" is mispronounced as "o"
Remember double 'OO' in between the strings z & sporangium which should not be misspelled with single 'O'
Wrong Spelling:  z-o-sporangium 
Correct Spelling:  z-oo-sporangium 
Check more misspelled words of Zoosporangium to spell it correct.