| 1. Two-celled ascospores | Cl. coprophilum |
| 1. One-celled ascospores | 2 |
| 2. Non-ostiolate ascomata | 3 |
| 2. Ostiolate ascomata | 4 |
| 3. Ascospores (22.5–)24.5–31(–36) × (11.5–)13–15.5(–16) μm | Cl. hyalocarpum |
| 3. Ascospores 12–17 × 9–12 μm | Cl. foecundissimum |
| 4. Ascomatal wall not areolate, ascospores 40–52 × 25–32 µm | Cl. olerum |
| 4. Ascomatal wall areolate, ascospores 47–58 × 22–28(–30) µm | Cl. tomentosum |
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