| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Chara fibrosa brevibracteata | Kasaki | | ? | Japan | Missing | Access |
| Chara globularis hakonensis | Kasaki, 1964 | | | Lake Ashi (=Ashinoko Lake =Hakone Lake), Hakone area, Kanagawa Prefecture, Honshū, Japan | Missing | Access |
| Chara rohlenae | J.Vilhelm, 1912 | | - | Montenegro & Serbia | Rediscovered | Access |
| Nitella flexilis bifurcata | Kasaki, 1964 | - | - | Tochigi Prefecture (incl. Lake Chuzenji), Japan | Rediscovered | Access |
| Nitella furcata fallosa | (H.Morioka) K.Imahori 1954 | | | Japan | Invalid (synonym) | Access |
| Nitella minispora | K.Imahori & H.Suga 1958 | | 1956 | Lake Kizaki, Nagano Prefecture, Chūbu region, Honshu, Japan | Missing | Access |
