Strains that belong to the Freshwater Diatom Collection (designated 'FD' in UTEX number) will require a minimum of 4-weeks to grow out before shipment.
Some algal strains are no longer available to purchase at UTEX. Since many research articles and publications—especially older references—may still cite a specific UTEX strain, we will continue to provide all available strain data we have for reference and/or informational purposes. Sometimes these unavailable strains might have a relative or sister copy listed in the "Algae Details" section, possibly providing an alternative Culture Collection to acquire it from.
You can also try using the "Search by Strain" feature of the World Federation for Culture Collections (WFCC) website, to see what other Culture Collections might carry it.