Dog lichen (Peltigera membranacea) on a willow ...

The image presents a close-up view of a willow tree trunk covered with dog lichen (Peltigera membranacea). The bark is characterized by its rough texture and grayish-brown color. Scattered patches of green moss are visible on the left side of the image.

Dog lichens are a type of crustose lichen, which means they grow directly on rocks or trees without forming a distinct thallus (the vegetative body of the lichen). They typically have a grayish-brown to tan color and often display irregular shapes. The dog lichen in this image has a large, flat growth form with wavy edges, giving it a unique appearance.

The tree appears to be situated near a road west from Kavgolovskoe Lake (Syariunlakhti), which is located north of Saint Petersburg, Russia. The date mentioned in the caption, July 26, 2024, suggests that the image was captured during the summer months when dog lichens are most active.

Overall, the image provides a detailed view of a willow tree trunk covered with dog lichen, highlighting their unique growth forms and habitats. – AI vision