I'm not certain but I think needs to be merged into Billbergia 'Fantasia' which is the legitimate cultivar name. "Marbled Rainbow Plant" is a common name.
The Bromeliad Society International Cultivar Registry has a listing for the cultivar 'Fantasia' but no cultivar by the name of 'Marbled Rainbow' and I found it at the following sites listed as 'Fantasia Group', Marbled Rainbow Plant .... which leads me to believe it is indeed a common name, rather than a legitimate cultivar: http://www.uky.edu/hort/sites/... https://www.lifestyle.com.au/p... http://www.plantthis.com.au/pl...
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