Difference between revisions of "Bifacial"

'''bifacial''' (''adj.'') – having two opposing surfaces that are alike but not identical (e. g., one side may be differently structured, coloured etc.). ''Attention'': If the outer surface organization is reflected internally by a clearly layered anatomy the thallus may better be referred to as a foliose thallus with an erect (''upright'') growth, e. g., in ''Evernia''. Many foliose lichen genera appear fruticose but their flattened lobes have a distinct upper cortex followed by an photobiont layer, medulla and lower cortex. The lower side thus has no photobiont layer and upper and lower cortex may have a different [[plectenchyma]] structure. In contrast, bifacial branches of fruticose lichens are internally more or less uniform.