Congrats! Your Bifr harrisoniae var. semi-alba looks very happy! There are several Bifr harrisoniae varieties, all from Brazil southeast. Yours has an unusual long spike to harrisoniae, resembles thyrianthina spikes (related species), but is for sure harrisoniae due small spur (thyrianthina has a extra-long spur). Take a look in my gallery, I posted Bifr harrisoniae type, alba and Bifr. tyrianthina (type) pics!
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Frederico
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