HISTO-ANATOMICAL ASPECTS REFFERING TO THE VEGETATIVE ORGANS OF TWO SUBSPECIES OF THYMUS PANNONICUS ALL.

The authors analyze comparatively two Thymus pannonicus subspecies (Thymus pannonicus ssp. auctus and Thymus pannonicus ssp. pannonicus). The vegetative organs (root, stem and leaf) of the two studied taxa were histo-anatomically investigated, evidencing the structure, localization and frequency of the secretory structures of essential oils. The secretory structures of essential oils are always multicellular, consisting of a basal cell, a unicellular pedicel and a gland which bears 1, 2 or 8 cells.