Plant atlas Short
Straw Mushroom: Cook It, and Its Deadly Twin
Straw Mushroom · เห็ดฟาง · Volvariella volvacea
Straw Mushroom — เห็ดฟาง (het-fang) — Volvariella volvacea.
Straw mushroom — het-fahng — grows on beds of rice straw, and the edible part is the young, unopened button, always cooked. In cell-culture studies, an alpha-glucan isolated from its fruiting body activated RAW264.7 macrophages. As a food, straw mushroom is a good source of protein, copper, selenium, and riboflavin. Protein helps build and maintain muscle, repairs body tissues, and helps you feel full. Copper helps your body use iron, supports normal energy metabolism, and keeps connective tissue and nerves healthy. Selenium is part of your antioxidant defenses and supports normal thyroid and immune function. Riboflavin, or B2, supports normal energy metabolism, helps reduce tiredness and fatigue, and backs your antioxidant defenses. In the kitchen, halved straw mushrooms simmer in the sour, chili-hot broth of Tom Yum Goong with prawns, or in the coconut-milk broth of Tom Kha Gai with galangal, lemongrass, and chicken; both are served over steamed jasmine rice. To grow it, pasteurize rice straw, layer it into raised beds, and add spawn. Wild-foraged lookalikes require expert identification because a deadly death cap can look nearly identical. For the next Thai kitchen ingredient with a real safety rule, follow Longevity Biome.
Tom Yum Goong — ต้มยำกุ้ง (tom-yum-goong)
Tom Kha Gai — ต้มข่าไก่ (tom-kha-gai)
Food and nutrients
Rich in: protein, copper, selenium, riboflavin
Research context
Straw-mushroom glucans activated macrophages in lab studies — Carbohydrate Polymers, 2020
Sources
Source: Cui et al. (2020). A macromolecular α-glucan from fruiting bodies of Volvariella volvacea activates RAW264.7 macrophages through the MAPKs pathway. Carbohydr Polym. DOI:10.1016/j.carbpol.2019.115674
Narration transcript
Opening
Straw mushrooms are picked as little grey eggs, before the cap ever opens, off the beds of rice straw they're grown on. Straw mushroom — เห็ดฟาง, het-fang. You eat that young, unopened button, always fully cooked, since raw straw mushrooms aren't safe.
Tom Yum Goong (ต้มยำกุ้ง)
In tom yum goong, a hot-and-sour prawn soup, halved straw mushrooms simmer in a chili-hot broth with prawns, lemongrass, and lime. Serve it over steamed jasmine rice.
Tom Kha Gai (ต้มข่าไก่)
The coconut-milk version, tom kha gai swaps that sour broth for one with galangal, lemongrass, and chicken. The mushrooms go in halved and cook until tender.
Nutrition summary
These little buttons stand out for selenium, a mineral few vegetables carry, along with copper and some folate.
Protein
Protein contributes to the growth and maintenance of muscle, helps repair body tissues, and helps you feel full and satisfied.
Copper
Copper helps your body use iron and maintain normal connective tissue.
Selenium
Selenium is part of your natural antioxidant defenses, supports normal thyroid function, and contributes to a healthy immune system.
Riboflavin (Vitamin B2)
Riboflavin contributes to normal energy metabolism, helps reduce tiredness and fatigue, and supports your natural antioxidant defenses.
Closing
If you ever forage instead of buying, have an expert check them first: the deadly death cap can look almost identical to an unopened straw mushroom. To grow your own safely, pasteurize rice straw, layer it into raised beds, and add spawn. Follow Longevity Biome, and LIKE this video for regular updates.
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