Sclerotesta

Seeds of Cycas revoluta with a middle sclerotesta, an outer sarcotesta and an endotesta inside

The sclerotesta (Gr. Sklērós = dry, hard) is part of the seed coat in botany . It is a hardened inner layer around the seed , which is formed by one or, in the case of the Bedecktsamern , two integuments or parts thereof. It always occurs together with a soft, often conspicuously colored, external sarcotesta . Sclerotesta and Sarkotresta are common in Cycadopsida and Ginkgophyta . Also with some flowering plants (e.g. magnolia family and Paeoniaceae or the pomegranate) both layers can be found.

proof

• Joachim W. Kadereit , Christian Körner , Benedikt Kost , Uwe Sonnewald : Textbook of plant sciences . Founded by Eduard Strasburger . 37th completely revised and updated edition. Springer Spectrum, Berlin / Heidelberg 2014, ISBN 978-3-642-54434-7 , p. 170 .