On Hemionitis atreyu, an invalid and unnecessary name, and on the correct name for that species if placed in Hemionitis (Pteridaceae subfam. Cheilanthoideae)

Abstract

New molecular phylogenetic and taxonomic publications on cheilanthoid and other ferns (Gastony & Rollo 1998, Smith et al. 2006, Schuettpelz & Pryer 2007, Schuettpelz et al. 2007, Zhang et al. 2007, Christenhusz et al. 2011, Eiserhardt et al. 2011, PPG I 2016, etc.) resulted in numerous recent nomenclatural changes and new taxonomic concepts of a rational generic circumscription in ferns in general and cheilanthoids (Pteridaceae subfam. Cheilanthoideae) in particular. These changes affected many taxa, in particular, the well-known species listed in recent literature mainly as Cheilanthes acrostica (Balbis 1801: 98) Todaro (1866: 215) or Allosorus acrosticus (Balb.) Christenhusz (2012: 284).