• Rhizo Funga 4T-Inj Unicorn Bag labeled Purple Mukitake (Sarcomyxa Serotina) being inoculated with Liquid Culture resulting in colonized Purple Mukitake Grain Spawn
  • Close-up young of Purple Mukitake (Sarcomyxa Serotina) mushorooms with intricate details
  • Cluster of Purple Mukitake (Sarcomyxa Serotina) with purple caps and beige stems on a white background
  • Close-up of textured yellow and Purple Mukitake (Sarcomyxa Serotina) mushooms
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Purple Mukitake (Sarcomyxa Serotina) Grain Spawn

$25.00 USD
$30.00 USD $25.00 USD
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Purple Mukitake—also called Late Fall Oyster—is a cold-weather species that produces glossy, violet-brown caps with firm, elastic flesh. Its flavor is mild and slightly earthy, complementing rich broths and roasted dishes. Known for its resilience, Mukitake fruits late into autumn when most species have finished, making it a valuable off-season crop.

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Hand holding up partially colonized Shiitake Whole Oat Grain Spawn in a 4T-INJ Unicorn bag with a white background.

About Our Grain Spawn

Built on the same Unicorn 4T-INJ bag platform as our sterilized grain, this spawn is inoculated to order with low-passage, agar-verified culture for clean, vigorous growth. Because it’s freshly inoculated, the bag will arrive partially colonized—or colonization may become visible within a few days, depending on species and shipping conditions. Hydration and gas exchange are tuned for fast, even colonization.

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Grow Guide

Sarcomyxa Serotina
Sarcomyxa serotina is a cold weather oyster relative known for olive to yellow brown caps that can read as purple or dusky in some lighting and photos. Flavor stays mild. Slow cooking concentrates it.

Best fit if you like cooler fruiting projects and want something different than standard oysters. Run it on hardwood based substrates. Keep humidity high. Increase fresh air as pins form so you get clean caps and better texture.

Cool-fruiting species. Best results below 55F.
  • Culinary
  • Hardwood pellets or sawdust
  • Hardwood supplemented w/ bran
  • Hardwood Logs
  • Indoor
  • Outdoor
  • Side-Fruiting
Low to moderate indirect light; 8-12 hours on, 16-12 hours off; Keep light indirect
  • Advanced

Compounds Identified in Sarcomyxa Serotina

Every strain carries its own chemical signature. These are the compounds found in this species — documented in the scientific literature for anyone who wants to dig deeper.

2 Active Compounds

  • Beta glucans and polysaccharides

    Known Benefits

    • Immune modulation via pattern recognition receptors including Dectin-1. Supports innate immune signaling and downstream adaptive responses. Often studied for immune resilience and inflammation balancing.

  • Ergosterol

    Known Benefits

    • Provitamin D2 precursor in mushrooms. Converts to vitamin D2 with UV exposure. Also reported antioxidant and anti inflammatory activities in reviews.

Frequently Asked Questions

While other methods may work, we prioritize quality and consistency. We utilize a thorough clean, soak, heat, and strain method that fully prepares the grain before sterilization. This additional effort results in a more consistent, high-quality grain that optimizes mycelium colonization and ensures stronger, healthier growth.
We only use the industry standard Unicorn Bags. 3 pound bags use 4T-INJ Bags and the 5 pound bags use a 3T. Both Include a 0.2-micron filter patch for controlled airflow and a secure injection port, facilitating easy inoculation with liquid cultures or spore syringes.
Colonization rates upon receipt will vary based on variety, transit time and temperature. Grains are Inoculated to order, so in most cases you will see visible mycelial growth upon receipt, but it's possible this will not occur until a couple days after. This depends on species and temperatures the grain spawn is exposed to during transit.
Keep in a cool, dark place during and after colonization. Once the bag reaches ~25% colonization, perform a gentle break and shake to redistribute mycelium and speed completion. Avoid opening until fully colonized and ready to expand into your substrate.