| 1. Ascospores pitted, with gelatinous sheath | J. vestita |
| 1. Ascospores warty or finely granulated, without gelatinous sheath | 2 |
| 2. Ascospores warty | J. rotula |
| 2. Ascospores finely granulated | 3 |
| 3. Ascomata with short neck | J. carbonaria |
| 3. Ascomata with long neck, up to 400 μm | J. antarctica |
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