Chlorencoelia versiformis
Chlorosplenium versiforme is a former name.  A sac fungus (ascomycete),
Chlorencoelia versiformis not only takes on many shapes, it also exhibits
various coloration.  Found in August growing from debarked hardwood
log.  Largest specimen 12mm wide.
See Chlorencoelia versiformis at
George Barron's Website on Fungi
See also Fungi of Iowa