| SNo. | Scientific Name | Locality | Habitat | Basis of Record | Recorded By | Record Number | Island | Source | Date |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Radula gracilis | Makaweli | Preserved_Specimen | Cooke Jr., C.M. | 128 | Kauai | BISH | 1903-11-03 | |
| 2 | Radula gracilis | Hakalau Forest National Wildlife Refuge, in and near Awehi Gulch, | Metrosideros polymorpha forest below Puu Akala cabin, including deep moist forested gulch. | Preserved_Specimen | Freire, A.V. | 2023246 | Hawaii | BISH | 2023-03-24 |
| 3 | Radula gracilis | Along Mt Kaala Rd, uphill from the water tanks and downhill from where the Dupont Trail meets Mt Kaala Rd, M.K. Thomas collections on this date, 09 NOV 2022 mostly from S side of road (some collections from N side). | Steep wet rock-cut face ranging from 1-9 m tall below overhanging patches of Machaerina angustifolia. | Preserved_Specimen | Thomas, M.K. | 493 | Oahu | BISH | 2022-11-09 |
| 4 | Radula gracilis | TNC Waikamoi Preserve, western fork of Honomanu Stream. | Wet montane forest of planted conifers (upper elevations) to native Metrosideros-dominated forest at lower elevations. | Preserved_Specimen | Freire, A.V. | 202397 | Maui | BISH | 2023-02-23 |
| 5 | Radula gracilis | Wailua to Hana | rainforest | Preserved_Specimen | Svihla, R.D. | 1862 | Maui | BISH | 1956-01-01 |
| 6 | Radula gracilis | Manuka State Wayside, on Highway 11 about Mile 82. Loop trail from parking lot clockwise to forested pit crater. 19° 06['32-7'05 N, 155° 458'50-49'33 W. | Disturbed native Metrosideros forest with Ochna serrulata common in understory. | Preserved_Specimen | Freire, A.V. | 2022853 | Hawaii | BISH | 2022-09-29 |
| 7 | Radula gracilis | Waikamoi Preserve | On trunk of dead Metrosideros. | Preserved_Specimen | Hall, J.B. | 76 | Maui | BISH | 1994-09-04 |
| 8 | Radula gracilis | Hakalau Forest National Wildlife Refuge. Nauhi Gulch, Ca.1 km mauka of Nauhi Cabin. | Deep moist gulch shaded by remnant Metrosideros Polymorpha forest. | Preserved_Specimen | Freire, A.V. | 2023300 | Hawaii | BISH | 2023-03-25 |
| 9 | Radula gracilis | along road near head of Kunoa Gulch | Exotic Eucalyptus-Leptospermum-Psidium cattleianum forest. With Herbertus gracilis, Plagiochila. | Preserved_Specimen | Freire, A.V. | 22394 | Lanai | BISH | 2022-03-23 |
| 10 | Radula gracilis | TNC Waikamoi Preserve, western fork of Honomanu Stream. | Wet montane forest of planted conifers (upper elevations) to native Metrosideros-dominated forest at lower elevations. On twigs in spray of waterfall. | Preserved_Specimen | Freire, A.V. | 2023134 | Maui | BISH | 2023-02-23 |
| 11 | Radula gracilis | Waahila Ridges Trail | growing on Ohia trunk in partially shaded, dry area | Preserved_Specimen | Futa, C.S. | 32 | Oahu | BISH | 1979-04-14 |
| 12 | Radula gracilis | along road near head of Kunoa Gulch | Exotic Eucalyptus-Leptospermum-Psidium cattleianum forest. | Preserved_Specimen | Freire, A.V. | 22393 | Lanai | BISH | 2022-03-23 |
| 13 | Radula gracilis | Hakalau Forest National Wildlife Refuge. Nauhi Gulch. Ca. 1 km mauka of Nauhi Cabin. | Deep moist gulch shaded by remnant Metrosideros Polymorpha forest. On a twig. | Preserved_Specimen | Freire, A.V. | 2023315 | Hawaii | BISH | 2023-03-25 |
| 14 | Radula gracilis | Lehuamakanoi | Preserved_Specimen | Cooke Jr., C.M. | 74 | Kauai | BISH | 1903-10-25 | |
| 15 | Radula gracilis | Honokaau Drainage Basin | Preserved_Specimen | Forbes, C.N. | 623 | Maui | BISH | 1917-10-17 | |
| 16 | Radula gracilis | Iao Canyon | Preserved_Specimen | Svihla, R.D. | 35230 | Maui | BISH | 1935-07-04 | |
| 17 | Radula gracilis | Kalalau flats | Preserved_Specimen | Cooke Jr., C.M. | 102 | Kauai | BISH | 1903-10-28 | |
| 18 | Radula gracilis | Windward side, Waiahole Valley Water Reserve | Preserved_Specimen | Svihla, R.D. | 1962 | Oahu | BISH | 1956-01-14 | |
| 19 | Radula gracilis | Makaweli | Preserved_Specimen | Cooke Jr., C.M. | 138 | Kauai | BISH | 1903-11-03 | |
| 20 | Radula gracilis | Kalalau flats | Preserved_Specimen | Cooke Jr., C.M. | 102 | Kauai | BISH | 1903-10-28 | |
| 21 | Radula gracilis | below Kokee, trail | Preserved_Specimen | Svihla, R.D. | 2107 | Kauai | BISH | 1956-02-21 | |
| 22 | Radula gracilis | Honokaau Drainage Basin | Preserved_Specimen | Forbes, C.N. | 623 | Maui | BISH | 1917-10-17 |