Prothalia or Prothallia: How To spell?

The word Prothalia is misspelled against Prothallia, which is plural of "Prothallium"

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