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"Tonight I worked on this #lichen and come to conflicting results. The medulla is K- (while cortex is K+-ish, better appreciated under UV) indicating Physcia stellaris. The thallus white, faintly maculate which would better fit P. aipolia. Would appreciate any feedback!"
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"Physcia lichen with black apothecia disks with grey rim on an oak branch. Squares are mm. Next to it Physcia tenella."
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"Side view of lichen thallus with simple rhizines connecting it to the bark and maculate upper cortex."
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"K reaction on a tangentally cut piece of lichen thallus. The cortex is green with a yellow tint. The medulla white."
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"K reaction under UV showing the cortex in yellow and the medulla non reactive. (bad colour balance as the stereo microscope camera does not behave well under uv illumination)"
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createdAt:
"2024-12-11T21:04:13.196Z"
