When it first appears above ground in the spring, the club/finger-shaped fruit of Dead Man’s Fingers (Xylaria polymorpha) appears powdery white from the asexual spores that cover its surface. As it matures, it acquires a crusty, black surface. This is the sexual stage. The interior of the fruiting body of this fungus is white; just inside the outer surface is a blackened, dotted layer containing structures called perithecia which hold sacs of sexual spores. Dead Man’s Fingers, unlike most fungi (which release their spores in a few hours or days) releases its spores over months or even years. It can have many separate “fingers” and sometimes the fingers are fused, causing it to look somewhat like a hand. Look for this fungus growing on hardwood stumps and logs, particularly American beech and maples.
Naturally Curious is supported by donations. If you choose to contribute, you may go to http://www.naturallycuriouswithmaryholland.wordpress.com and click on the yellow “donate” button.