sˌoʊ ˈɜːɹɪθɹˌɑːsoːɹə lˈɪɾɚɹəli mˈiːnz ɹˈɛd hˈiːp, ɹᵻfˈɜːɹɪŋ tə ðə ɹˈɛd sˈɔːɹi ɔnðɪ ˌʌndɚsˈaɪdz ʌvðə pˈɪnuːlz.
So erythrosora literally means red heap, referring to the red sori on the undersides of the pinnules.