Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 1 accessions of Calyptridium pygmaeum in orthodox seed collection. There are as many as 3150 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.
Based on an August 2020 extract of the California Plant Rescue Database, California Botanic Garden has collected 1 seed accessions of Calyptridium pygmaeum from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 10 maternal plants
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