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Myriotheca arnoldi

Myriotheca arnoldi was named by Pfefferkorn et al. (1971). Its type locality is Mazon Creek, which is in a Kasimovian deltaic mudstone/ironstone in the Carbondale Formation of Illinois.

Synonymy list
YearName and author
1971Myriotheca arnoldi Pfefferkorn et al.

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genusMyriothecaZeiller 1883

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

H. W. Pfefferkorn et al. 1971M. arnoldi has a pinnately divided frond; free sporangia cover the pinnules on the abaxial side. M. arnoldi has the largest sporangia and pinnules so far known in the genus, but is otherwise similar to M. angelica, M. monomakhoffi and M. permica.