Cross-section through a heteromeric lichen thallus. Such thallus is usually divided in these layers:
a) upper cortex
b) layer containing the photobiont (in this case alga)
c) medulla / loosely packed hyphae
d) lower cortex
e) rhizines
Based on these sources:
https://upload.wikimedia.org/wikipedia/commons/8/82/Lichen_cross-section.png
https://rbg-web2.rbge.org.uk/lichen/lichen_cross_section.jpg
https://teara.govt.nz/files/p-10980-pc.jpg
http://protist.i.hosei.ac.jp/PDB/Images/Chlorophyta/Trebouxia/sp_6b.jpg
https://botany.natur.cuni.cz/licheno/soubory/aktuality/SLE_zakladni_znalosti_1.pdf (page 8)
Čeština:
Schematický řez heteromerickou stélkou lišejníku. Heteromerická stélka je rozdělena na jednotlivé vrstvy, na schématu jsou tyto:
a) svrchní korová vrstva
b) vrstva s fotobiontem
c) dřeňová vrstva
d) spodní korová vrstva
e) rhiziny
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