Large Oyster Mushroom Enjoying Tipperary Soft Weather.

Oyster Mushroom (Hypsizygus ulmarius)

Spotted this week in Thurles, Co. Tipperary, an oyster mushroom making the most of the mild autumn weather; a perfect reminder of how resilient and fascinating these woodland dwellers are.

Oyster mushrooms are among the most popular edible fungi in Ireland, known for their delicate flavour and firm texture. They are versatile in cooking and can be added to soups, pasta, and stir-fries, or sautéed as a side dish.

They typically grow high up on the trunks and branches of broadleaf hardwood trees in mixed woodlands.

Their fruiting bodies are semicircular or shell-shaped, often with smooth, pale caps that catch the light in forests. Though similar in look to other oyster-like species, this particular variety, Hypsizygus ulmarius, belongs to a different genus entirely. Its Latin name offers a small map of its habits: hypsi meaning “high up”, zygus referring to a “yoke”, and ulmarius translating to “of the elms”, its favourite tree host.

You’ll usually find these mushrooms sprouting individually from branch scars and wounds on living elms and box elders, though they occasionally make their home on beech, maple, willow, oak, or even, as in this case, an apple tree.

While they prefer living trees, slowly causing white rot in the wood, they can also thrive on fallen trunks and decaying branches. That duality, living as both parasite and saprotroph (Latter an organism that feeds on or derives nourishment from decaying organic matter), makes them remarkable survivors, feeding either on the living or the dead.

So next time you’re walking through a Tipperary woodland, look up, not down. The quiet life clinging to the bark above might just be an oyster mushroom enjoying the same soft weather as the rest of us.