mummified caterpillars on a fallen redbud leaf. Same as seen here:
http://ipm.ucanr.edu/PMG/S/I-LP-SCON-HF.002.html
Here: https://bugguide.net/node/view/989641/bgimage
and here: https://www.natureblog.org/parasitic-wasp-and-caterpillar/
and: http://springfieldmn.blogspot.com/2016/08/redbud-mummies.html
Seems likely this is the parasitic work of a Hyposoter sp. wasp.
Growing from soil on the edge of a creek bed.
On a highly rotted log at the edge of the Natchaug River
Growing on a decorticated, wet log at the forested edge of the Natchaug River.