The following is a list of the collections made by Williams in species name order. The records are of species which occur in Tanzania (either as a native/naturalised species or as a cultivated species).
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| No | Species | Record date | Recorder(s) | Coll. | Det. | Conf. | Herbaria | Habitat | Location | Loc code | Outing code | Planted code | Country | QDS | Grid ref. | FZ Div | Alt. (m) | Notes | Lat | Long | Loc Acc Code |
| 42108 | Selaginella mittenii | 14 Jan 1969 | OG Williams |
OG Williams RSES 25 | SRGH |
Ground in forest | Makurupine forest, Chimanimani | 0 | Zimbabwe | 2033A1 | E | 0 | 0.000000 | 0.000000 | 2 |