Taxon;"Primary host";"Secondary host";Distribution;Notes;"Additional references" "R. albigubernum";Citrus; ;"Baidicheng, Fengjie, Sichuan, China";"Known only from the type series, which consists of two alate vivipara.";  "R. arundinariae"; ;"Arundinaria tecta";"Gainesville, FL";"Known only from the type series, which were found as dense colonies on ventral side of younger A. tecta leaves that contained aptareae and alatae on 16 April 1930. ";  "R. cerasifoliae";"Prunus pennsylvanica, P. virginiana";"Cyperaceae, including Schoenoplectus, Scirpus, and Eleocharis. Also Juncus (Juncaceae)";"North America, wherever host plants occur";"Can persist throughout summer on primary host.";  "R. chusqueae"; ;"Chusquea tomentosa";"Costa Rica";"Lives close to the nodes and well protected by leaves of C. tomentosa, so not easily detectable. Alatae and lifecycle unknown";  "R. dryopterae";"Dryopteris filix-mas"; ;Kyrgyzstan ; ;  "R. enigmae"; ;"Typha, especially. T. latifolia; also recorded from Sparganium ";"North America, wherever host plants occur, though apparently most common in the East (A. Jensen, pers. comm.). ""R. laconae"" is morphology restricted to southeastern coastal plain.";"Autoecious on cattails, no primary host known.";  "R. maidis";"Prunus, including P. cornuta (Pakistan), P. mume and P. persica (Korea), and P. sargentii (Japan). ";"Zea, Sorghum, Hordeum,other Poaceae; occasionally Cyperaceae and Typhaceae.";"Cosmopolitan, but cannot survive outdoors in regions with severe winter climates";"Most lineages are autoecious anholocyclic, with males and ovipara occurring only rarely. Heteroecious, androcyclic populations are known from Asia, where the species originated. In the Northern Hemisphere, lineages with different chromosome counts are associated with different hosts: 2n = 10 colonize Hordeum and Echinochloa crus-galli, while 2n = 8 colonize Zea and Sorghum; lineages with 2n = 9 , 2n = 11, and heterozygous 2n = 8 are also known. In contrast, 2n = 8 and 2n = 9 lineages in Australia do not exhibit host preference. Morphological and early genetic investigations of North American lineages reported incomplete morphological separation and lack of genetic differences between the various parthenogenetic karyotype lineages of R. maidis, though future investigations may raise one or more lineages to species from within the complex.";"Wildermuth and Walter (1932), Blackman (1954), Menon and Ghai (1969), Brown and Blackman (1988), Blackman et al. (1990), Blackman and Brown (1991), Barro (1992), Simon et al. (1995), Jauset et al. (2000)" "R. musae";"Prunus beseyi, P. subcordata, P. fasciculata";"Scirpus; also Musa, Ensete, Sterlitzia";"WA to CO, MD (native); Europe, Middle East, Africa, and Australia (adventive)";"Adventive populations outside of the native range are presumed to be anholocyclic. Specimen vouchers reportedly sent to the USNM are not present in the collection and were presumably never sent.";" Taber (2003)" "R. nigrum";Crataegus;"Avena sativa, Zizania aquatica, Alisma";"ON, MB, AK; unconfirmed reports from OR, UT"; ;"Pantoja et al. (2006)" "R. nymphaeae";Prunus;"Aquatic and semi-aquatic plants, including Alisma, Juncus, Nelumbo, Nuphar, Sagittaria, Sparganium and Typha. Occasionally other hosts, including Canna, Glyceria, Lactuca, Triticum, and Tulipa";Cosmopolitan; ;  "R. oxyacanthae";"Various Rosaceae including Malus, Pyrus, Cotoneaster, Crataegus, Sorbus, and Prunus";"Various Poaceae, including Agropyron, Agrostis, Festuca, Poa; occasionally cyperaceae and Juncaceae.";"North America (probable native range), Europe, North Africa, Japan";"The name R. insertum Walker was used widely for the species in North America, but García Prieto et al. (2004) synonymized the species with R. oxyacanthae.";  "R. padi";"Primarily Prunus virginiana (North America) and P. padus (Europe), occasionally other Prunus. One record on Syringa vulgaris.";"Primarily Poaceae, occasionally Asteraceae, Brassicaceae, Cyperaceae, Iridaceae, Juncaceae, Lilaceae, Typhaceae and other taxa.";Cosmopolitan;"Can persist throughout summer on primary host.";  "R. padiformis"; ;"Poa, Triticum ";"BC, MT";"Primary host and associated morphs not known; alate males have been obtained in culture.";  "R. parvae"; ;"Carex (US), Scirpus lacustris (Italy)";"Native to North America (IL); Italy (adventive)";"Primary host not known.";  "R. rufiabdominale";"Primarily Prunus; also recorded from Malus, Chaenomeles, Pyrus, Rhodotypos, and Sorbus.";"Underground parts of Poaceae (including cereals) and Cyperaceae. Can infest some dicots (e.g. Asteraceae, Solanaceae), especially in greenhouse and hydroponic situations.";"Native to East Asia. Currently pan-tropical/subtropical and restricted to greenhouses in colder climates.";"Heteroecious holocyclic in East Asia and Italy; autoecious anholocyclic in majority of introduced range. Rakauskas et al. (2015) noted that if the heteroecious holocyclic forms recently reported from Italy spreads the species may persist in cold climates in Europe.";"Etzel and Petitt (1992), Ciampolini et al. (1993), Zilahi-Balogh et al. (2005)" "R. rufulum";Crataegus;"Primarily Acorus, also recorded from Typha";"North America and Europe, wherever hosts are found."; ;  "R. sanguinarium";"Crataegus mexicana";"Unknown, but reared on various Poaceae in lab conditions";Mexico; ;  "sp. nov. ""ex. Arisaema""";Unknown;Arisaema;Maryland; ;  "R. sp. T";Unknown;Cereals;"New Zealand"; ;  "R. near insertum";Unknown;Cereals;"New Zealand; Victoria, Australia"; ;  "R. sp. x";Unknown;"Zea mays";"Victoria, Australia"; ;