Prothali or Prothalli: How To spell?

The word Prothali is misspelled against Prothalli, which is plural of "Prothallus"

Prothalli has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings protha & i which should not be misspelled with single 'L'
Wrong Spelling:  protha-l-i 
Correct Spelling:  protha-ll-i 
Find more incorrect spellings of Prothalli to spell right way.