American White Pelican (Pelecanus erythrorhynchos). Photo © Arlene Koziol. Read more about Things seen in the Bird Division #9 (or: The fish that killed a pelican)
As a symbiosis between a fungus and a photosynthetic alga or cyanobacterium, lichens have particular challenges when it comes to reproduction and growing fully mature lichens out of tiny baby lichens. Many lichens have mastered this challenge by producing small thallus portions that already look like tiny lichens and, once dispersed, immediately start growing and forming a fully functional lichen. These tiny "greenhorn" lichens growing on their parent lichen are called phyllidia or lobules, due to their flattened appearance that resembles the lobes of mature lichens, only much smaller. Read more about How lichens reproduce with "greenhorn" baby lichens...
Lichens come in all colors and shapes, but many lichens are green when hydrated and metabolizing, due to their green algal photobionts. So it is not surprising that lichens are often mistaken for plants, even if they actually represent symbiotic fungi and hence are more closely related to animals. To make the confusion perfect, the internal anatomy of many lichens resembles that of plant leaves, with the photobiont layer positioned in a similar way as the chlorophyll layer in leaves. Read more about "Window" lichens mimick highly adapted desert plants