Rhizopus nigricans, the breadmold, a harmless mold species known to grow on bread
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Russula nigricans, the blackening brittlegill or blackening russula, a gilled mushroom species found in woodland in Europe
Schoenus nigricans | S. nigricans | Russula nigricans | Rhizopus nigricans | Prochilodus nigricans | Clarias nigricans |
In the species S. nigricans, females usually mate with a single male each morning during spawning seasons.