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Destructive Sampling Policy The judicious dissection of specimens is normally permitted for those involved in research projects. The permanent removal of plant material (i.e., destructive sampling) must be approved by the curator for purposes such as SEM studies, DNA sampling, and anatomical and palynological investigations. Before any sampling can be undertaken, a 'Destructive Sampling Agreement' must be signed and returned to the Curator. Approval - Material may not be removed from herbarium specimens without approval from the curator. Permission is granted on a case-by-case basis and is contingent upon receipt of a signed 'Destructive Sampling Agreement.' Requests - Requests for destructive sampling must detail the taxa and specimens involved, the procedures to remove material, and the method of preparation for study. Sampling - Samples may be removed only when there is sufficient material on a sheet and when damage to the specimen can be avoided. Ideally, material should be taken from fragment packets. Limitations - Material may not be obtained from type specimens, important historical collections, or taxa represented in the herbarium by few specimens (except in rare circumstances). Annotations - Each sheet must be annotated indicating the type of material removed, the name and institution of the researcher, the nature of the study, and the date of removal. See comments on annotations under Loan Policy for guidelines on preparation of annotation labels. Data - Images of material used for SEM or light microscopy should be deposited in the herbarium. Such images should include the taxon name, collector and collection number, OKL accession number, and method of preparation. Any DNA sequence data derived from these specimens should be deposited with GenBank and the GenBank accession number placed on the annotation label. Resulting Publications - One copy of a publication based upon specimens from OKL should be sent for deposit in the herbarium library. This
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