hill and mountain zone
No secondary growth, rings absent, vessels in groups, vessel diameter <20 mµ, fibers absent, simple perforations, intervascular pits scalariform and round, pervasive parenchyma, rayless, sieve cell groups stay irregularly in the central cylinder (included phloem) sieve cell and vessel groups do not form distinct vascular bundles. Crystals absent.
Uniform anatomy without sieve elements.
For explanations please see the Feature Characteristics.
© 2005 WSL - F. Schweingruber, W. Landolt, last update 18.11.2010