@arboretum_amy, that gets all the Ferns and Horsetails) but doesn’t include the Lycophytes because those classes collect at subphylum Vascular Plants.
@janouse, “class” has a specific taxonomic meaning, lower than the division between ferns/horsetails, and lycophytes. You probably mean a non-taxonomic collection of the Classes Polypodiopsida and Lycopodiopsida within Vascular Plants.
You can use the browser command line to select multiple taxa. Here is a tutorial about the command line: https://forum.inaturalist.org/t/how-to-use-inaturalists-search-urls-wiki/63
To find all the unidentified ferns and lycophytes in your default location, try pasting this in your browser command line:
https://www.inaturalist.org/observations?taxon_ids=121943,47623&quality_grade=needs_id
If you need to look in multiple locations, this command will show everything in Texas and California:
https://www.inaturalist.org/observations?place_id=14,18&quality_grade=needs_id&taxon_ids=121943,47623