Key to the species of Dictyosphaeria
| 1 | Thalli hollow, with one layer of vesicle-like segments enclosing space, or expanded, ruptured; segments 0.5 - 5 mm wide | D. cavernosa |
| 1 | Thalli with small segments, to 2 mm wide, joined into a solid cushion | D. versluysii |
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