NECTRIA/TARGET CANKER (Neonectria galligena)

Nectria Canker is often called Target Canker. Nectria has other forms of Canker, but this particular disease, with its very identifiable structure, is caused by a fungus, Neonectria galligena. In its advanced stages it has corky curls at the edges of the "target". I look forward to the opportunity to go back to Parvin and get better pictures of this Canker, properly ID the trees it's on (Sassafrass likely), and maybe, just maybe, get a picture of the tiny fungus itself.
https://ag.umass.edu/fact-sheets/perennial-nectria-canker
and at:
http://forestrydev.org/diseases/CTD/Group/Canker/canker7_e.html
In BC, CA (British Columbia, Canada) - 2 other Nectria species causing noticeable perennial hardwood cankers
-European Canker, N. galligena Bres., hardwoods and fruit trees
-N. ditissima Tul. on Red Alder ("Isolates of N. ditissima are being considered as biological control agents for red alder.")
http://maple.dnr.cornell.edu/pubs/diseases/bark.htm
http://flickrhivemind.net/Tags/nectria/Timeline

2015-6-9: Many thanks to Dr. Hemant Gohil, Agricultural and Resource Management Agent at the Cooperative Extension of Gloucester County, Rutgers, for identifying this as Nectria Canker. After researching the symptoms he states that these trees have "deformities related to Nectria Canker. It's a fungus which penetrates in to the wound caused by various reasons - winter injury, bird pecking, insect damage. In this particular case it happened years back. It does not kill the plant but the various shaped deformities which gets enlarged over the years." He also says the fungus is common to many hardwood plants. He sent many helpful links that allowed me to narrow it down to N. galligena. And, thanks to Linda Strieter, 4-H Program Coordinator at Rutgers, for putting me in touch with Dr. Gohil in the first place.