Rhizina undulata (Pine firefungus)
Rhizina undulata
North America, Europe
2-10 cm diameter
This site contains no information about the edibility or toxicity of mushrooms.
Rhizina undulata, also known as Pine firefungus, is a large, irregular, brown or black fungus that grows in clusters on burned soil or conifer debris. The mushroom is parasitic on conifer seedlings and has caused considerable damage to tree plantations worldwide. It grows infrequently from early summer to early autumn.

Fruiting body flat, with irregular lobes, and attached to the growing surface on the entire lower side by numerous whitish to yellowish rhizoids resembling plant roots. The margin is pale yellow, similar to the underside, and wavy and irregular, while the rest of the fruiting body is dark purple-brown to blackish. Surface sticky as moist. In very young fruit bodies, the surface is white. The brown colour initially appears in the centre and expands rapidly thereafter. The flesh is reddish brown, tough and thick. Spores dark brown or black.

Microscopic Features: The spores are fusiform (fuse-shaped), apiculate, minutely verricose when mature, with one or two oil drops. They measure 30–40 µm in length and 8–11 µm in width.

Rhizina undulata on Wikipedia.

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