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these are on the cut across the fallen (or felled) log
the stringy cords of rhizomorphs from my viewport. I’ll have to take another look at the pics.
These are not rhizomorphs, they are demarcation lines highlighting the boundary between competing microorganisms, otherwise known as spalted wood.
The zones lines are mostly mycelium, also called a pseudosclerotial plate. The outer hard black crust of Inonotus obliquus f. sterilis (chaga) is also a pseudosclerotial plate.
Armillaria rhizomorphs that I have seen most often under the sloughing bark of hardwoods, especially oak. See obs # 299584, 276563 and 301477 for some good examples.
Zone lines and white rot are more common in hardwood species. It could be a combination of different fungi working in concert or a single fungus.
Robinson, S. C., & Laks, P. E. (2010). Wood species and culture age affect zone line production of Xylaria polymorpha. Open Mycology Journal, 4, 18-21. https://benthamopen.com/contents/pdf/TOMYCJ/TOMYCJ-4-18.pdf
Sorry but as often the case with these logs, I don’t know what tree it was when it was alive :-(
Created: 2018-05-15 21:34:47 PDT (-0700)
Last modified: 2018-05-16 20:10:52 PDT (-0700)
Viewed: 89 times, last viewed: 2018-05-28 07:54:29 PDT (-0700)