| Substance | Abbreviation | Systematics | Provings |
| Macphersonia gracilis |
Macp-g | Sapindaceae |
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| Macrolepiota procera Parasol Mushroom |
Macrol-pr | Agaricaceae |
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| Macropus giganteus /Lac macropi Eastern Grey Kangaroo |
Macrop-g | Macropodidae |
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| Macrothylacia rubi Fox moth |
Macroth-r | Lasiocampidae |
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| Macrotinum Macrotinum |
Macrin | Ranunculaceae |
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| Maerua cafra Common bush-cherry |
Maer-c | Capparaceae |
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| Magnesium bromatum Magnesium Bromide |
Mag-br | Bromium Magnesium |
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| Magnesium carbonicum Magnesium carbonate hydroxide pentahydrate |
Mag-c | Magnesium |
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