Vein

vein (noun, pl. veins) – strand of conducting or strengthening tissue, broad or narrow, often ± raised, branched and sometimes anastomosing, often pigmented, rib-like or ridge-like structure on the lower surface of Peltigera and Solorina, perhaps functioning instead of a lower cortex. Can be caninoid, malaceoid, or polydactyloid (see Ainsworth & Bisby). This is:part of lower thallus surface.

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