The word Perichetium is misspelled against Perichaetium, a noun meaning "Same as Perichaeth."
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Perichaetium has vowels 'ae' together mispronounced as 'e'
Word contains consecutive vowels 'AE' in between alphabets perich & tium is misspelled as 'E'
Wrong Spelling:  perich-e-tium 
Correct Spelling:  perich-ae-tium 
Check more misspelled words of Perichaetium to spell it correct.