Eocronartium has long been considered a parasitic Auriculariales, perhaps representing an ancestral form of our modern-day rusts of higher plants. Septal ultrastructure of two collections of E. muscicola reveals a pore structure essentially identical to those of the Uredinales and Septobasidiales and different from those of other Auriculariales studied thus far.
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Khan et al. (1980) studied this question.