Taeniophyllum, Section (Taeniophyllum)
Tamayorkis, Genus – synonym of Malaxis, Genus
Tankervillia, Genus – synonym of Phaius, Genus
Tapeinoglossum, Section (Bulbophyllum)
Tapeinoglossum, Genus – synonym of Bulbophyllum, Genus
Tapeinoglossum, Genus – synonym of Tapeinoglossum, Section (Bulbophyllum)
Tartarinorchis, Genus – synonym of Goodyera, Genus
Taurantha, Genus – synonym of Pterostylis, Genus
Tetrodon, Genus – synonym of Eria, Genus
Thisbe, Genus – synonym of Herminium, Genus
Thrixspermum, Section (Thrixspermum)
Thylacis, Genus – synonym of Thrixspermum, Genus
Thylacoglossum, Genus – synonym of Glomera, Genus
Thynninorchis, Genus – synonym of Arthrochilus, Genus
Thysanochilus, Genus – synonym of Eulophia, Genus
Titania, Genus – synonym of Oberonia, Genus
Trachoma, Genus – synonym of Tuberolabium, Genus
Trachychilus, Section – synonym of Codonosiphon, Section (Bulbophyllum)
Trachylepus, Section (Taeniophyllum)
Trachyrhachis, Genus – synonym of Bulbophyllum, Genus
Trachyrhachis, Genus – synonym of Lepanthanthe, Section (Bulbophyllum)
Trachyrhachis, Section – synonym of Lepanthanthe, Section (Bulbophyllum)
Trias, Genus – synonym of Bulbophyllum, Genus
Tribrachia, Genus – synonym of Bulbophyllum, Genus
Trichochilus, Genus – synonym of Dipodium, Genus
Trichorhiza, Genus – synonym of Luisia, Genus
Trichosia, Genus – synonym of Trichotosia, Genus
Trichosma, Genus – synonym of Eria, Genus
Trigonanthus, Genus – synonym of Ceratostylis, Genus
Triorchis, Genus – synonym of Spiranthes, Genus
Tripleura, Genus – synonym of Zeuxine, Genus
Tripudianthes, Genus – synonym of Bulbophyllum, Genus
Trudelia, Genus – synonym of Vanda, Genus
Tubilabium, Genus – synonym of Myrmechis, Genus
Tulotis, Genus – synonym of Platanthera, Genus
Tussaca, Genus – synonym of Goodyera, Genus
Tylostylis, Genus – synonym of Eria, Genus