| Thalloidima sedifolium ( Scop.) Kistenich, Timdal, Bendiksby & S. Ekman, 2018 |
| Toniniopsis Frey, 1926 |
| Toniniopsis aromatica (Sm.) Kistenich, 2018 |
| Trichoramalina Rundel & Bowler, 1974 |
| Trichoramalina crinita (Tuck.) Rundel & Bowler, 1974 |
| Vermilacinia Spjut & Hale, 1995 |
| Vermilacinia cedrosensis (J.E. Marsh & T.H. Nash) Spjut, 1996 |
| Vermilacinia cerebra Spjut, 1996 |
| Vermilacinia ceruchis (Ach.) Rundel & Bowler, 1978 |
| Vermilacinia ceruchoides (Rundel & Bowler) Spjut, 1996 |
| Vermilacinia howei Spjut, 1996 |
| Vermilacinia johncassadyi Spjut, 1996 |
| Vermilacinia laevigata (Rundel & Bowler) Spjut, 1996 |
| Vermilacinia leopardina Spjut, 1996 |
| Vermilacinia nylanderi Spjut, 1996 |
| Vermilacinia rigida Spjut, 1996 |