Plantae incertae sedis

Plantae incertae sedis includes 13 children:

• Anomalophycus
• Bilobites
• Biumbella B. L. Mamet 1970
• Clautriava
• Cryptozooen J. Hall 1883
• Diplofusa I. C. Cookson & A. Eisenack 1960
• Disphaeria Cookson & Eisenack 1960
• Eotetrahedrion Schopf & Blacic 1971
• Myxohiella
• Pterospermella
• Pterospermopsis W. Wetzel 1952
• Toshiba
• Tytthodiscus Norem
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