Volume 85, 1957-58
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Key to Marsupial Genera
| 1. | Leaves conduplicately bilobed, the dorsal lobe smaller than the ventral | 1 | Balantiopsis | |
| Leaves not conduplicately bilobed | 2 | |||
| 2. | Stems with underleaves | 3 | ||
| Stems without underleaves (minute in Acrobolbus cinerascens) | 4 | |||
| 3. | Leaves and underleaves deeply bifid, resembling a Lophocolea | 2 | Geocalyx | |
| Leaves ovate, entire, underleaves bifid | 3 | Saccogyna | ||
| 4. | Plants very small, pale or brownish, leaves round, not greater than 0.7 mm, margined (in our species) | 4 | Jackiella | |
| Leaves of plants more than 0.7 mm, except in Tylimanthus rotundifolius, never brownish | 5 |
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| 5. | Stems erect or sub-erect, marsupium not longly prostrate | 6 | ||
| Stems prostrate, marsupium terminal long, cylindrical, more or less buried in the ground | 7 | |||
| 6. | Marsupium terminal, androecia leafy, terminal or intercalary on the main stem resembling Lophocolea | 5 | Tylimanthus | |
| Marsupium basal, androecia whitish, spicate on long or short branches | 6 | Marsupidium | ||
| 7. | Leaves bilobed | 7 | Acrobolbus | |
| Leaves entire | 8 | Lethocolea |