The function provides nitrogen nutrition to the fungus, so the mutual relationship is produced.
Where can we see lichens? You can’t see lichens in Beijing, Shanghai, and Guangzhou. But when we go to the wild, we can see lichens on tree trunks, branches, building surfaces, and even glass surfaces.
In some special environments, such as arid desert areas or some high-altitude areas, we can see that after some animals die, the deep surface of the bones is also covered with lichen, and even the surface of the teeth will have lichen Appeared. Teeth are made of enamel, which is very nutritious, but lichens can support themselves tenaciously and live very well.
In some ethnic minority areas in Yunnan, there will always be a special dish at the wedding banquet, which is made of tree flowers. The tree flower is a kind of lichen, used to eat cold.
We asked the local villagers, why do you have such a dish at every wedding banquet? They say this symbolizes the permanent reconciliation of the couple. There is another possibility, is it true that the common people have long ago realized that lichen is a symbiotic relationship?
The role of lichen
When we go to Lijiang, Shangri-La and other areas, we can see that most of the lichens are eaten as vegetables