Plant taxonomy and keeping track of cultivars is messy business. Keeping track of T. ionantha cultivars is especially difficult due to regional differences, the popularity of unofficial naming, the ease with which T. ionantha is able to hybridize, its highly-variable appearance, and more. Remember, cultivars are a specific subset of a species that display particular characteristics and were created by human intervention, rather than by nature (varieties are particular subsets of a species created by and found in nature). The official authority on Tillandsia cultivars is the Bromeliad Society International (BSI): "The BSI is the only International Cultivar Registration Authority for Bromeliaceae, appointed by the International Society for Horticultural Science's Commission for Nomenclature and Cultivar Registration. Publication of bromeliad cultivar photographs and relevant information on any other website do not constitute registration." (https://www.bsi.org)
Does that mean that any named T. ionantha NOT listed within the register are fraud/mislabelled/wrong? No- it just means the BSI does not officially view it as a registered cultivar. There are many unregistered versions of T. ionantha that have distinct and special characteristics- many of these may soon become registered in the future.
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