[$1 Protist classification] at [$2 micro*scope] (genera)
[$3 AlgaeBase] (all levels of classification; cite using :Template:ALGAE)
Mosses: [$4 Classification of the Bryophyta] (genera)
Vascular embryophytes: [$5 World Checklist of Vascular Plants] global consensus view of all known vascular plant species (flowering plants, conifers, ferns, clubmosses and firmosses)
International Fossil Plant Names Index (IFPNI) [$13 name search] (cite using Template:IFPNI)
International Plant Names Index (IPNI) [$6 name search] (cite using Template:IPNI)
TROPICOS at the Missouri Botanical Gardens: [$7 name search] (Vascular plant synonymy, name publication info)
Plants of the World Online [$8 ("POWO")] by Royal Botanic Gardens, Kew
[$9 Index Nominum Genericorum]
[$10 Index Herbariorum]
[$11 Appendices I-VIII] to the ICN (proposals and requests for decisions under the code)
[$12 World checklists of selected plant families] (Kew Garden)