The spelling of "pleurosorus" is determined by its phonetic transcription. In IPA, the word is spelled /plʊərəsɔːrəs/. The first syllable is pronounced like "ploo-uh", with a slight emphasis on the first vowel. The second syllable is pronounced like "ruh", with a quick, unstressed vowel sound. The third syllable is pronounced like "sawr", with a clear "s" sound and a long, emphasized vowel. The final syllable is pronounced like "uhs", with a quick, unstressed vowel sound. Overall, the spelling of "pleurosorus" closely matches its pronunciation in IPA.