[2] On fertile fronds, the sori are protected by false indusia formed by the edge of the leaf curling back over the underside.

[2] Among its congeners in Mexico, M. allosuroides is similar to M. cucullans and M. notholaenoides in its largely undifferentiated false indusia and elongate sori along veins, but those species have more indument on their leaf tissue and lack the groove on the stipe and rachis.

[1] M. wrightii is also similar in having a grooved stipe and rachis and nearly glabrous fronds, but its false indusia are broken into interrupted lobes rather than being continuous.

[6] In 1877, the difference in sori and false indusia led Conde Vittore Trevisan to create a new genus, Cheilosoria, for C. allosuroides and a few other species of Cheilanthes.

Convergent evolution in arid environments is thought to be responsible for widespread homoplasy in the morphological characters traditionally used to classify it and the segregate genera that have sometimes been recognized.

On the basis of molecular evidence, Amanda Grusz and Michael D. Windham revived the genus Myriopteris in 2013 for a group of species formerly placed in Cheilanthes.

[9] In 2018, Maarten J. M. Christenhusz transferred the species to Hemionitis as H. allosuroides, as part of a program to consolidate the cheilanthoid ferns into that genus.

M. allosuroides belongs to what Grusz et al. informally named the alabamensis clade, and is sister to a group consisting of M. mickelii, M. pringlei, and M. peninsularis.

After examination of the type material at Kew, John T. Mickel and Alan R. Smith placed this species in synonymy with C. allosuroides in 2004,[2] although Christenhusz recognized it as distinct and transferred it separately to Hemionitis as H. pallida in 2018.

[18] Myriopteris allosuroides grows throughout most of Mexico, but is absent from the Baja Peninsula and the northeastern and extreme southeastern provinces, the southward range ending in Veracruz and Oaxaca.