Mosses
Only one genus of sawflies is known to feed on mosses in Britain. The sawfly Nesoselandria morio feeds on the following genera.
Plagiomnium
Pseudobryum
Dicranum
Ceratodon
Hedwigia
Plagiothecium
Polytrichum
Ferns
The families Blasticotomidae, Heptamelidae, and the Tenthredinidae subfamilies Selandriinae and Trenthredininae have larvae that feed on various ferns. The Blasticotomidae and Heptamelidae mine the fronds whilst the others are free feeders.
Asplenium (Spleenworts)
Aneugmenus
Athyrium (Lady Ferns)
Blasticotoma, Heptamelus, Aneugmenus, Stromboceros, Strongylogaster, Tenthredo (livida)
Gymnocarpium (Oak Fern)
Stromboceros
Blechnum (Hard-fern)
Heptamelus
Pteridium (Bracken)
Blasticotoma, Aneugmenus, Stromboceros, Strongylogaster, Rhogogaster, Tenthredo (balteata, colon, ferruginea, livida)
Dryopteris (Buckler-ferns)
Blasticotoma, Aneugmenus, Strongylogaster, Tenthredo (mioceras, ferruginea)
Polystichum (Shield-ferns)
Blasticotoma
Polypodium (Polypody)
Heptamelus, Stromboceros
Horsetails
Only the Tenthredinidae genus Dolerus has larvae that feed on horsetails with the vast majority being on the wetland species.
Equisetum
Dolerus aericeps, Dolerus bimaculatus, Dolerus junci, Dolerus eversmanni, Dolerus germanicus, Dolerus gessneri, Dolerus gilvipes, Dolerus pratensis, Dolerus pratorum, Dolerus vestigialis, Dolerus yukonensis
Equisetum arvense (Field Horsetail)
Dolerus aericeps, Dolerus germanicus, Dolerus pratorum
Equisetum fluviatile (Water Horsetail)
Dolerus pratensis, Dolerus junci
Equisetum palustre (Marsh Horsetail)
Dolerus gessneri, Dolerus pratensis, Dolerus junci, Dolerus aericeps, Dolerus vestigialis, Dolerus eversmanni, Dolerus germanicus
Equisetum pratense (Shady Horsetail)
Dolerus pratorum
Equisetum sylvaticum (Wood Horsetail)
Dolerus vestigialis, Dolerus gessneri, Dolerus gilvipes