Warning message Node revision 1465 not found in node The structure mesophyll of the plate leaves of wheat. Perharps it was deleted. Node revision 1465 not found in node Sclerenchyma development in some species of trees of Rosaceae. Perharps it was deleted. Smirnova Anna Nikolaevna RussiaСыктывкарInstitute of Biology of the Komi Science Centre of the Ural Division RAS, 28 Kommunisticheskaya st., 167982 Syktyvkar, Komi Republicsmirnova@ib.komisc.ru Author's articles Morphological and biological characteristics of seeds Hypericum perforatum and H. maculatum crantz growing in the north