This cross-section of a Tomatillo (Mexican husk tomato, Physalis philadelphica) reveals its internal structure under two different lighting conditions. Top Image (Visible Light): The fruit is a two-carpellate berry, which means it is divided into two main internal chambers (locules) filled with seeds. One can see the fleshy placenta in the center where the small, flat, yellowish seeds are attached. The entire fruit is enclosed in a papery, green husk (calyx) that has expanded to cover the berry as it matured. Bottom Image (UV Fluorescence): Under ultraviolet light, the tomatillo displays a striking fluorescence. The bluish-white glow in the center is likely due to phenolic compounds or other metabolites common in plant tissues that fluoresce under UV. The outer ring glows a distinct orange-red. This is characteristic of chlorophyll fluorescence. College Station, Texas
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Thu 6 Nov 2025 09:35:43 - Exposure: 2.5 sec - Aperture: F/32. - Focal length: 100 mm - ISO 125
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Album 3780: College Station, Lake Somerville, Texas, October 22 - November 7, 2025
