- Ardisia tenuis, Ardisia pirreana;Icacorea tenuis;Auriculardisia tenuis;Auriculardisia pirreana
- Aspicilia tenuis, Lecanora tenuis
- Bactris simplicifrons, Yuyba essequiboensis;Yuyba dakamana;Bactris tenuis;Yuyba stahelii;Bactris carolensis;Bactris cuspidata var tenuis;Bactris luetzelburgii;Yuyba maguirei;Bactris sororpanae;Yuyba gleasonii
- Calypogeia sphagnicola, Kantius sphagnicola Arnell & JPerss;Calypogeia tasmanica Rodway;Calypogeia tasmanica;Calypogeia tenuis var minuta;Calypogeia tenuis var sphagnicola;Calypogeia tenuis;Calypogeia trichomanis L Corda;Calypogeia trichomanis var sphagnicola;Calypogeia trichomanis var tenuis;Cincinnulus trichomanis var sphagnicolus;Kantia sphagnicola;Kantius sphagnicolus;Kantius trichomanis var tenuis;Mnium trichomanis
- Cleistes tenuis, Pogonia tenuis
- Davilla kunthii, Davilla aspera;Davilla tenuis;Davilla surinamensis
- Dendrobangia boliviana, Clavapetalum elatum;Clavapetalum surinamense;Dendrobangia tenuis;Asterolepidion elatum
- Drepanolejeunea angustifolia, Drepanolejeunea tenuis;Jungermannia tenuis Reinw & al 1824, non Ehrh 1789;Lejeunea angustifolia;Lejeunea tenuis
- Frullania brasiliensis, Frullania brasiliensis var robusta;Frullania capilliformis;Frullania caracensis;Frullania cocosensis;Frullania columbica;Frullania effusa;Frullania goebelliana;Frullania hastatistipula;Frullania mucronata;Frullania robusta Spruce Steph, non Kiaer 1891;Frullania rufa;Frullania spruceana;Frullania tenuis;Jungermannia mucronata
- Herbertus aduncus, Herberta adunca subsp tenuis;Herberta adunca;Herberta hutchinsiae subsp shusteri;Herbertus aduncus subsp hutchinsiae;Herbertus aduncus subsp schusteri;Herbertus aduncus subsp tenuis;Herbertus hutchinsiae;Herbertus minor;Herbertus remotiusculifolius;Herbertus sakuraii fo remotiusculifolius;Herbertus tenuis;Jungermannia adunca;Schisma aduncum Dicks Dumort;Schisma pusillum;Sendtnera adunca Dicks Gottsche & Rabenh;Sendtnera adunca var hutchinsiae
- Leuctra tenuis, Nemoura tenuis;Narrow-lobed needlefly
- Lotus glaber, Narrow-leaved Birds-foot-trefoil;Lotus corniculatus subsp tenuis (Waldst & Kit) Syme;Lotus tenuis;Narrow-leaf Birds-foot Trefoil;Lotus tenuis Waldst & Kit ex Willd
- Medicago medicaginoides, Trigonella tenuis
- Pimelea angustifolia, Narrow-leaved Pimelea;Calyptrostegia angustifolia RBr CAMey;Banksia angustifolia RBr Kuntze;Pimelea nervosa Meisn;Calyptrostegia nervosa Meisn Walp;Banksia nervosa Meisn Kuntze;Pimelea tenuis MBScott;Pimelea tenuis MBScott var tenuis;Pimelea tenuis var longistyla MBScott
- Rhynchospora trichochaeta, Trichochaeta tenuis;Rhynchospora denticulata;Rhynchospora mexicana var trichochaeta
- Stoastomops adamsi, Helicina tenuis
- Tayloria serrata, Tayloria serrata var flagellaris;Tayloria serrata;Bruch & Schimp var tenuis;Tayloria tenuis
- Telaranea redacta, Lepidozia chaetophylla var tenuis;Lepidozia redacta
- Vulpiella stipoides, Vulpiella tenuis
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