This plant grows in our rural hometown, as long as it is a cool and damp place, I have always known that it is a kind of fern, and I also dug it home and made a potted plant when I was a child, but I don't know what kind of treasure I missed.
This plant is the kidney fern, and its underground tubers are the childhood memories of many rural post-80s and 90s boys. Kidney fern, named for its sporangia and the kidney-shaped shape of the spores. Kidney fern is also called centipede grass, stone yellow bark, swan egg, phoenix egg, it is an epiphytic or native perennial herbaceous plant of the family Kidney Fern and Kidney Fern.
And the kidney fern is not only beautiful, it also has a reputation as a "soil cleaner". Its underground root system can adsorb heavy metals such as arsenic and lead in the soil, effectively preventing the soil from being polluted by these heavy metals. Studies have shown that the adsorption capacity of kidney ferns for heavy metals is 800 times that of ordinary plants. In today's increasingly prominent environmental protection issues, kidney ferns have undoubtedly contributed to our environment.
But the most peculiar thing about it is that the place where it grows will grow dense egg-like things, just like eggs, also called phoenix eggs, it is the underground block of kidney fern, and it is a bit similar to potatoes, it also has a name called stone yellow peel, yellow peel fruit, it is said that it can be eaten directly after washing, a bit like the taste of sweet potato, and it feels like salsa when eaten.
Originally, I wanted to learn about the kidney leaf membranous fern, but I thought it was the same when I saw the kidney fern, but I didn't expect the gap between the two to be very different, and the kidney fern can be seen everywhere in the countryside, the kidney membranous fern (Hymenophyllum nephrophyllum) is a rare membranous fern native to New Zealand, with a single kidney-shaped leaf about 5-10 cm high. In hot weather, they wilt to retain moisture, but when wet weather returns, they open again. They are very rare because they need to grow in specific habitats, such as damp and shady forests, and this rare plant is very sensitive to environmental changes.
As you can see from the pictures, the light transmission of the leaves is very good, and this is due to the fact that this species has very thin leaves, only four to six cells thick. Interestingly, there are immature sporangia at the edge of the leaf. Lined up one by one, dense phobia is afraid that it will be uncomfortable, but obsessive-compulsive disorder will feel very comfortable when looking at it, and some people may even want to squeeze them out one by one and arrange them neatly to see if they are exactly the same.
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