Taxonomic comments on the “Flora of North America north of Mexico”, vol. 2, with some new nomenclatural combinations for Pteridophyta

New taxonomic classification is suggested for some pteridophyte and gymnosperm species included in the "Flora of North America north of Mexico", Volume 2 . New combinations are proposed for some species of genera Bryodesma Sojak (Selaginella s. lato), Hippochaete MiIde (Equisetum s. lato), and Sceptridium Lyon (Botrychium s. lato). New genus Holubiella Škoda (Ophioglossaceae) is created . It is monotypic comprising Botrychium lunarioides Michx. that was formerly separated in Botrychium Sw. subg. Sceptridium (Lyon) Clausen sect. Hiemobotrychium W. H. Wagner. Objections against reintroduction of the names Asplenium trichomanes-dentatum L. and A. trichomanes-ramosum L. are expressed. An Appendix with detail comments on the nomenclature, synonymics, chromosome counts and distribution of individual taxa in the Flora is added .