Dyckia delicata

Dyckia delicada is almost unseen abroad even on pictures
the real thing is literally impossible to be seen up to now.
Why the reddish form was not mentioned?
Did it pass unseen or did seen and not taken on account for a single note?

Rubra or reddish forms are usual to many bromeliads and are
not conditioned to any seasonal condition. They are true red plants.