[3] When the genus name Peridictyon was published in 1991, the authors cited the type as the combinatio nova Peridictyon sanctum (Janka) Seberg, Fred.

& Baden, based on Festuca sancta Janka.

[3] The description provided in the original publication of F. sancta includes remarks about finding the species, and describes a few of its features, but does not list any characters that would distinguish it from other species in the genus Festuca.

[4] The Index Nominum Genericorum has judged this to mean that Festuca sancta was a nomen nudum, and hence Peridictyon was not a validly published name.

[5] Other sources disagree; the International Plant Names Index states that the descriptive characters given are sufficient for the publication of the species name Festuca sancta.