Sphagnum Greyling

Often referred to as the "Moss Assassin" or the Marsh Shank, Sphagnurus paluster is a small but fascinating fungus with a dark secret. While most mushrooms act as nature's recyclers or helpful partners to trees, this delicate species is a true parasite. It is a specialist of the peatlands, known for its unique ability to attack and consume living moss, making it a signature sight in wild, soggy bogs.

🔍 How to Identify

• 🍄 The Cap: Small and fragile, usually 1–3 cm across. It starts as a bell shape and flattens out, colored in shades of watery grey-brown or tan that fade as the mushroom dries.
• ⚪ The Gills: Broad and relatively far apart, these are pale grey to white and are "adnates," meaning they are broadly attached to the stem.
• 🥢 The Stem: Exceptionally long, thin, and hollow. Because it grows in thick moss, much of the stem is often hidden deep underground to reach the moist base.
• ☁️ Spore Print: When pressed against paper, it leaves a distinct white spore print.

🌲 Habitat & Ecology

• 💧 The Sphagnum Specialist: You will almost never find this mushroom on soil or wood. It is strictly tied to Sphagnum moss. If you see a patch of moss that looks sickly or brown, look closely—the Marsh Shank is likely the culprit.
• ⚔️ A Rare Parasite: Unlike many fungi that wait for plants to die, this species is "necrotrophic." It actively kills the moss cells to feed on the nutrients, creating visible dead spots in otherwise vibrant green bog carpets.
• ☁️ Seasonal Timing: It prefers the high humidity of late summer and autumn, popping up after heavy rains have saturated the peat.

⚠️ Safety & Toxicity

• 🚫 WARNING: Inedible. Sphagnurus paluster is not considered a food source and should never be consumed.
• 👅 Mealy Scent: It has a very distinct "farinaceous" (mealy or flour-like) smell and a bitter taste, which are natural deterrents.
• 🎭 Dangerous Lookalikes: It grows in the same wet habitats as the Galerina marginata (Funeral Bell), which is deadly poisonous. Because small brown mushrooms are notoriously difficult to tell apart, they should be observed but never tasted.

✨ Fun Fact

Most fungi help plants grow by sharing minerals, but Sphagnurus paluster is one of the few mushrooms that behaves like a predator. Scientists have found that it uses specialized enzymes to punch through the tough cell walls of the moss, literally eating the bog alive!