Pistilida or Pistillida: How To spell?

The word Pistilida is misspelled against Pistillida, which is plural of "Pistillidium"

Pistillida has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings pisti & ida which should not be misspelled with single 'L'
Wrong Spelling:  pisti-l-ida 
Correct Spelling:  pisti-ll-ida 
Find more wrongly spelled words of Pistillida to spell it well.