Sporangia of sparse-lobed grape fern (Botrychium biternatum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight taken from Lick Creek ParkLick Creek: Background Notes. College Station, Texas

🎞️ #3639-08

The image features two photographs of sporangia on Botrychium biternatum, a type of grape fern, captured under different lighting conditions.

**Left Photograph:**
The left photograph displays the sporangia illuminated by regular daylight. The yellowish-green spore clusters are visible as small spherical structures attached to the underside of leaves. They resemble miniature green grapes, giving rise to the plant's common name "grape fern." The background is dark due to the absence of UV light.

**Right Photograph:**
In contrast, the right photograph shows the same sporangia illuminated by a 365 nm ultraviolet (UV-A) blacklight. Under this specific wavelength of light, the spore clusters exhibit an intense green fluorescence. This effect highlights the unique properties of these structures, which can only be visualized using UV light.

**Key Observations:**

* The sporangia are small and spherical in shape.
* They are attached to the underside of leaves, resembling miniature grapes.
* Under regular daylight, they appear yellowish-green.
* Under 365 nm UV-A blacklight, they emit an intense green fluorescence.

Overall, this image provides a striking comparison between the appearance of Botrychium biternatum sporangia under different lighting conditions. – AI vision

🇪🇸 Descripción en español / Spanish Description

Las esporangias de helecho uva escasa (Botrychium biternatum) cuando se exponen a la luz del día habitual, así como también cuando se iluminan con una luz negra ultravioleta (UV-A) de 365 nm tomada desde el Lick Creek Park. College Station, Texas, noviembre de 2024. La imagen muestra dos fotografías de esporangias en Botrychium biternatum, un tipo de helecho uva, capturadas bajo diferentes condiciones de iluminación. **Fotografía izquierda:** La fotografía izquierda muestra las esporangias iluminadas por la luz del día habitual. Los racimos de esporas amarillentas son visibles como pequeñas estructuras esféricas unidas al lado inferior de hojas. Recuerdan a miniaturas uvas verdes, dando lugar al nombre común "helecho uva". El fondo es oscuro debido a la ausencia de luz UV. **Fotografía derecha:** En contraste, la fotografía derecha muestra las mismas esporangias iluminadas por una luz negra ultravioleta (UV-A) de 365 nm. Bajo esta longitud de onda específica de luz, los racimos de esporas presentan una fluorescencia verde intensa. Este efecto resalta las propiedades únicas de estas estructuras, que solo pueden visualizarse usando luz UV. **Observaciones clave:** * Las esporangias son pequeñas y de forma esférica. * Están unidas al lado inferior de hojas, pareciéndose a miniaturas uvas. * Bajo la luz del día habitual, aparecen amarillentos-verdes. * Bajo luz UV-A de 365 nm, emiten una fluorescencia verde intensa. En general, esta imagen proporciona una comparación sorprendente entre el aspecto de las esporangias de Botrychium biternatum bajo diferentes condiciones de iluminación. – Spanish translation

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