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I'm no Latin scholar, but I suspect that seminationis is a noun (derived from the verb seminatio) in the genitive case. As a noun in apposition, it should retain its original spelling. If it is an adjective, then the ending should be changed to match the gender of the genus, which is indeed neutral (stoma being a Greek word of neuter gender). Despite a couple of hours searching, I cannot find out whether seminationis is a noun or an adjective. :( Anyone got a very big Latin dictionary? :)