Edible tree fungus is rich in nutrients and is generally consumed in its dried form. However, fresh edible tree fungus contains a type of photosensitive substance called psoralen. This substance is sensitive to light. After consumption, exposure to Taiyang (EX-HN5) can cause solar dermatitis, with symptoms such as itching, edema, and pain in sun-exposed areas of the body, and even necrosis. In severe cases, throat edema can lead to difficulty breathing. Therefore, fresh edible tree fungus should not be consumed immediately. It must be dried first, as the psoralen photosensitive substances will naturally disappear and lose their toxicity, making it safe to eat. Additionally, spoiled white edible tree fungus can produce a large amount of Flavobacterium farinofermentans, which can cause stomach discomfort after consumption, and in severe cases, toxic shock.

Note:

1. Phytophotodermatitis: Certain plants contain photosensitive substances. When the skin comes into contact with the juice of these plants' fruits, peels, seeds, flowers, roots, stems, or leaves, and is then exposed to ultraviolet light, it can cause redness and swelling of the skin in the contact area, and even blisters. After a few days, melanin deposition forms, and this post-inflammatory melanin deposition usually takes several weeks to months to fade naturally.
2. The photosensitive substances in plants are chemically known as furocoumarins or psoralens. Many plants can cause this condition, such as lemon, lime, pomelo, finger citron, bitter orange, grapefruit, fig, aiyu jelly, creeping fig, wild celery herb, cilantro, carrot, European Indian epimeredi herb, Chinese Angelica, fennel fruit, dill, Psoralea, Peucedanum, hairyvein agrimonia herb, etc.
3. Edible tree fungus (scientific name Auricularia polytricha) contains various nutrients and has been a commonly used nutritional food in China since ancient times. Data from China shows that fresh edible tree fungus contains furocoumarins, which may cause phytophotodermatitis after consumption. No similar cases have been reported domestically. English literature indicates that edible tree fungus contains adenosine (9-beta-d-ribofuranosyl adenine), and there have been case reports of significant platelet dysfunction within three hours of consuming more than 70 grams of the plant, lasting up to 24 hours.
4. White edible tree fungus (scientific name Tremella fuciformis berk), also known as silver ear, has a mouse LD50 of 17870 mg/kg, with toxic effects including inducing epilepsy or lowering the potential required for epilepsy.
5. Flavobacterium farinofermentans was cultured from fermented corn meal in cases of food poisoning in China. Experiments found that Flavobacterium farinofermentans contains a heat-resistant low molecular weight toxin called flavotoxin A. The oral LD50 of flavotoxin A in mice ranges between 0.68 mg/kg and 6.84 mg/kg, with mice dying from neuro and cardiac toxicity.

Summary:

Consuming excessive amounts of edible tree fungus can cause coagulation problems. Chinese reports suggest that consuming fresh edible tree fungus may cause phytophotodermatitis, although no similar cases have been reported domestically. Excessive consumption of white edible tree fungus has its own toxicity, and Flavobacterium farinofermentans also has its own toxicity. Domestic literature has not investigated the relationship between Flavobacterium farinofermentans and white edible tree fungus, but it is not recommended to consume white edible tree fungus if it has spoiled and been infected by bacteria.