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  • First-generation (G1) Hypsizygus tessellatus isolate, the buna-shimeji with marbled tan caps
  • Colonizes grain in about 18 days at 68–80°F
  • Fruits cold at 45–65°F and 90–93% humidity; harvest about 20 days later
  • Firm, crisp texture; bitter raw, sweet and nutty once cooked
  • Includes a 16G 1.5" Luer Lock needle and alcohol prep pad; ships insulated
Retail: $19.99
Price: $11.50
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    Item #: BRB10
    Availability: In Stock
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    Our Brown Beech is a first-generation Hypsizygus tessellatus isolate, the buna-shimeji. It grows in tight clusters of small marbled-tan caps on firm stems that stay crisp through cooking, and it fruits colder than anything else we carry.

    • H. tessellatusSpecies
    • G1Isolated genetics
    • ~18 daysColonization
    • 45–65°FFruiting temp
    • IntermediateDifficulty

    Why grow our Brown Beech culture

    A texture mushroom

    Small caps and firm stems that keep their bite in stir-fries, clear soups and pan sauces instead of going soft.

    Coldest fruiter we carry

    It fruits at 45–65°F, colder than Blue Oyster or Chestnut. Ideal for an unheated basement or garage in winter.

    Nutty once cooked

    Rich, mildly sweet and nutty after heat. Raw, it's bitter, so it's never a salad mushroom.

    Inoculating with liquid culture

    1Warm and shake

    Let the syringe reach room temperature, then shake it gently to break up and spread the mycelium through the broth.

    2Sterilize

    Flame the needle until it glows, let it cool a few seconds, and wipe the injection port with the included alcohol pad.

    3Inject

    Use 2–3cc per quart jar or 3–5cc per 3–5 lb grain bag. One 10cc syringe inoculates about 2–4 containers.

    4Incubate

    Keep it at 68–80°F in the dark. Shake once at about 30% colonization to speed things up.

    Keep it cold: Brown Beech won't fruit well in a warm room. If your space stays above about 65°F, grow an oyster instead and save this one for winter.

    Brown Beech growing parameters

    SpecDetail
    Scientific nameHypsizygus tessellatus
    GeneticsFirst-generation (G1) isolated culture
    Recommended substratesRye berries for spawn; supplemented sawdust or straw for bulk
    Incubation temperature68–80°F
    Incubation humidity85–90%
    Colonization timeAbout 18 days on grain
    Fruiting temperature45–65°F
    Fruiting humidity90–93%
    Time to harvestAbout 20 days after fruiting conditions start
    PreparationMust be cooked; bitter raw, sweet and nutty once heated
    In the package10cc syringe, 16G 1.5" Luer Lock needle, alcohol prep pad
    StorageRefrigerate at 35–45°F; never freeze

    From our lab to your grainRun it into jars with wide-mouth cultivation lids or your own lids with self-healing injection ports. Spare 16G needles and sterile Luer Lock syringes are sold separately.

    Frequently asked questions

    How much liquid culture do I use per jar or bag?

    Use 2–3cc per quart grain jar and 3–5cc per 3–5 lb spawn bag. One 10cc Brown Beech syringe inoculates roughly two to four containers. Using more doesn't speed colonization much; it just uses up the syringe.

    How long does Brown Beech take to colonize grain?

    About 18 days at 68–80°F, then roughly 20 days to harvest once you drop the temperature into the 45–65°F fruiting range.

    What's the best substrate for Brown Beech?

    Rye berries for spawn, then supplemented hardwood sawdust or straw for bulk. Supplemented sawdust gives the denser, more uniform clusters.

    Do Beech mushrooms have to be cooked?

    Yes. Raw beech mushrooms are bitter. Cooking removes the bitterness completely and brings out a sweet, nutty flavor with a firm, slightly crunchy texture.

    How should I store the syringe?

    Refrigerate it at 35–45°F in the bag it shipped in and never freeze it; freezing ruptures the cells and kills the culture. Bring it to room temperature and shake gently before you inject.

    Why liquid culture instead of a spore syringe?

    Liquid culture is living mycelium from an isolated culture, so it skips germination, colonizes days faster and gives genetically consistent fruits. Spores have to germinate and pair up first, which is slower and more variable from grow to grow.

    Packed to arrive alive

    Liquid culture is living mycelium, so every syringe leaves our lab in a foil-lined insulated mailer. The insulation buffers it against summer heat in a delivery truck and against sub-freezing winter temperatures, so it arrives viable either way.

    Myco Labs liquid culture syringe packed in a foil-lined insulated mailer

    When it arrives: refrigerate the syringe at 35–45°F until you're ready to inoculate. Never freeze it. Bring it to room temperature and shake gently before use.

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