1. Laboratory of Anatomy and Morphology, V. L. Komarov Botanical Institute of Russian Academy of Sciences, Prof. Popov Street 2, 197376, St. Petersburg, Russia;
2. School of Biological Sciences, Washington State University, Pullman, Washington 99164‐4236 USA;
3. Department of Baking Technology, Urals State Economic University, Ekaterinburg, Russia