Not on a cultivated plant but I saw a N. ephippiata in the wild doing
exactly the same. The whole has nothing to do with a mutation but is
a simple growth disorder which can happen from time to time.
Bye,
Andreas
Andreas Wistuba; Mudauer Ring 227; 68259 Mannheim; Germany
Phone: +49-621-705471; Fax: +49-621-711307
E-Mail: andreas.wistuba@rhein-neckar.de