| 1. | Ascomatal neck roughened lacking sulcations, ascospores (10–)10.5–12(–12.5) × 4.5–5 μm ……………………………………… C. collapsa |
| 1. | Ascomatal neck sulcate ………………………………………………………... 2 |
| 2. | Ascospore longer than 16 μm, (16–)17–20(–21) × 6–7 μm ……………….……………………………………………………………..………… C. tenebrosa |
| 2. | Ascospores up to 16 μm long …………………………………………..…….. 3 |
| 3. | Ascospores 11–14.5(–16) × 4–5 μm …………………..….. C. subdenudata |
| 3. | Ascospores 14.5–16 × 5–6 μm ………………………………..…... C. tropica |
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