| Name | Macilvainea Nieuwland |
| Authorship | Nieuwland |
| Rank | Genus |
| NomenclaturalStatus | NomSuperfl |
| Placed in | Coelomycetes |
| Remarks | Illegitimate substitute name for Peckia Clinton (1878), non Vellozo (1829). |
| Citation | May 1916 Amer. Midl. Naturalist 4: 381 |
| Name | Macilvainea Nieuwland |
| Authorship | Nieuwland |
| Rank | Genus |
| NomenclaturalStatus | NomSuperfl |
| Placed in | Coelomycetes |
| Remarks | Illegitimate substitute name for Peckia Clinton (1878), non Vellozo (1829). |
| Citation | May 1916 Amer. Midl. Naturalist 4: 381 |