Efficacy of Pteridium aquilinum: Pteridium aquilinum seedlings are small and sharp, curled and bent inward, shaped like a cat's paw, turquoise, and spread out after maturity. Petiole yellow-brown, up to one to two feet long; Rhizomes grow horizontally underground, with a layer of dark brown fuzz on the outside, which contains a lot of high-quality starch and can be used to extract fern powder.

Harm of Pteridium aquilinum: In general, there is no harm;

Extended data:

Pteridium aquilinum is a perennial herb of Polypodiaceae. The underground rhizome is dark brown, long and horizontally extending, with a diameter of 0.6 ~ 0.8 cm, a length of 10 cm and a maximum length of 30 cm. Leaves grow from underground stems, which are three-pinnate compound leaves, and the total length can reach more than 100 cm, slightly triangular. The 1 second lobe is opposite;

The second lobe is oblong-lanceolate, pinnately divided, the lobule is linear-oblong, glabrous or hairy only on the dorsal midvein, and the veinlets are pinnately branched. Leaf margin curled inward. When the petiole is tender, there are fine hairs, and after herbalization, the stem is smooth and the hairs disappear. At the beginning of summer, the reproductive organs, that is, the ascomycetes, are embedded in the leaves, which are ochre brown.

Baidu encyclopedia-Pteridium aquilinum