Agrocybe dura
A grassland agaric listed as edible in historical and scientific catalogues for Hong Kong and China. Taxonomic concepts and practical food value vary; the listings do not establish safe identification or culinary practice.
Cultures
Seed Pei starter
Seed Pei is a retained solid starter from the acetic-acid stage of some Chinese solid-state vinegar processes, carried from one batch to the next.
A retained solid starter for one process stage
The 2024 study defines seed Pei, also called vinegar Pei, as previous-batch solid or semi-solid inoculum used during the acetic-acid fermentation stage of some Chinese solid-state vinegar processes. It distinguishes Pei from Daqu, which is used earlier for saccharification and alcoholic fermentation, and from liquid vinegar mother.
Regional products do not imply one standard Pei
The study compared four industrial samples from four producers: two Zhenjiang aromatic vinegar starters, one Shanxi aged vinegar starter and one Sichuan bran vinegar starter. It describes distinct grains and process configurations. The two Zhenjiang samples differed from each other, while the Shanxi and Sichuan samples appeared more similar in this study's comparisons. The samples were collected at different fermentation ages, so the comparison does not isolate geography as a cause.
Measured conditions are study findings, not home limits
The researchers found associations between measured moisture, pH, reducing sugar and microbial distribution in their samples. These comparisons do not set household operating ranges or identify every organism's role. A separate 2023 Zhenjiang experiment compared traditional seed-grain inoculation with direct inoculation using selected cultured strains. Those are distinct experimental strategies, not interchangeable names for Pei.
Household method and storage remain open
Studies of Pei have examined producer processes and laboratory samples, not a household recipe. Home propagation, retained-starter storage, transfer-failure handling and a safe finished-vinegar endpoint are not established. No general safety limit or finished-vinegar acidity endpoint is set, and a qualified process review is still needed.
Places
China
Documented use · Country evidenceThe 2024 study sampled industrial starters from Zhenjiang, Shanxi and Sichuan producers; it does not establish one standard Pei.
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Sources
Frontiers in MicrobiologyMethod · History
Metagenomics profiling of the microbial community and functional differences in solid-state fermentation vinegar starter (seed Pei) from different Chinese regionsSeed Pei is previous-batch solid or semi-solid inoculum used in the acetic-acid stage of some Chinese solid-state vinegar processes.
Four industrial samples from four producers were compared.
Cited in: A retained solid starter for one process stage; Regional products do not imply one standard Pei; Measured conditions are study findings, not home limits; Household method and storage remain open
Frontiers in MicrobiologyMethod
Inoculation strategies affect the physicochemical properties and flavor of Zhenjiang aromatic vinegarTraditional seed-grain inoculation was compared with direct inoculation using selected cultured strains.
Cited in: Measured conditions are study findings, not home limits; Household method and storage remain open