Dead man's fingers forms black, club-shaped or finger-like stromata, often in clusters, at the bases of rotting hardwood stumps and on buried wood. Young stromata are pale with a white tip and a powdery coating of conidia in spring; mature ones are black with a tough white interior. It is a saprobe that causes a soft rot.
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Habitat
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Saprobic on decaying hardwood stumps and logs, usually at or near the stump base, sometimes on buried wood so that it looks terrestrial; also on woody pods, petioles and herbaceous stems. Alone or more often in clusters. Young stromata appear in spring and mature in late summer and fall.
Distribution
Cosmopolitan, recorded on all six inhabited continents. In North America widespread and common from the Rocky Mountains eastward.
Characteristics
Stroma: 3-14 cm tall, 1-3 cm thick (up to 5.5 cm when irregular); club-shaped or strap-like, often split into finger-like parts; young stroma pale to dark grey, often bluish or purplish, with a white tip and powdery conidia; mature stroma dark brown to black, pimply or wrinkled, with a black, fuzzy rooting stalk up to 7 cm. Flesh: White, very tough, with a dark rim of perithecia. Spore print: Black. Spores: 20-28 x 6-8 µm, with a long germ slit.