APE-R is a variety of Psilocybe cubensis that was developed from APE but drops spores. The revert alludes to the return to the canonical phenotype from the APE phenotype (canonical spore color and shape/size, no albino spores, produces spore prints and does not require swabbing). APE-Revert is not a stabilized variety and there is an expectation of some variance in shape/size. A historic sample to have in your spore library.
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