Epithets
| ciliatus | hair |
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| cineraceus | ash colored, gray |
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| cinerascens | ash colored, gray |
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| cinereus | ash colored, gray |
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| cinnabarinus | cinnabar red |
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| circinatum | rounded |
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| circinatus | rounded |
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| citrellus | lemon yellow |
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| citreus | lemon yellow |
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| citrinellus | lemon yellow |
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| clandestina | hidden |
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| clandestinus | hidden |
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| clausa | closed |
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| clausus | closed |
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| coccifer | berry bearing |