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    Membranosphaera bulluliniformis forma sphaerica
                    | bulluliniformis forma sphaerica | |
| Samoilovitch, S.R. and Mtchedlishvili, N.D. (eds.) (1961) | |
| Lentin, J.K. and Williams, G.L. (1973) | |
| junior synonym | |
| 
                                                            No synonyms
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