These were found on the same log as observation 54326.
This is the first time I have seen these since 2008, perhaps because in 2009 and 2010 I visited this site much later in the season.
Most of the specimens were growing from logs, something I have never seen with P. zapotecorum. Three mushrooms were growing from dirt on a landslide slope nearby.
Blue micrographs stained with methylene blue. When the scale is visible, the divisions are one micrometer.