Pycnoporus cinnabarinus (Jacquin) Karsten
Species: P. cinnabarinus
Pycnoporus cinnebarinus (Jacquin) Karsten (Basidiomycota, Polyporaceae) is very widespread in North America and most commonly found on dead hardwoods. This fungus us a saprotroph and will cause a nice white rot on the dead trees which cross paths with it (figure 3).
Pycnoporus cinnebarinus is a bright orange fungus with an even brighter orange/red pore surface (figure 1). The undersurface of this fungus is covered with very minute pores which produce ellipsoidal shaped spores (figure 2). and which produce a white spore print (figure 2).
Figure 1. Pycnoporus cinnebarinus (PLP847_2018_201). Minute pore surface of Pycnoporus cinnebarinus (left) and the KOH reaction, resulting in a dark purple to gray discoloration (right).
This fungus does not possess a stipe of any sort to speak of, but instead the cap simply grows out of the side of a downed tree trunk. The cap will react to KOH and change to a deep purple color, turning to a more grayish hue as time passes (figure 1).
Kuo, M., & Methven, A. S. (2014). Mushrooms of the Midwest. University of Illinois Press.
Kuo, M. (2010, February). Pycnoporus cinnabarinus. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/pycnoporus_cinnabarinus.html
MycoBank Pyncoporus cinnebarinus, Web. 7, November, 2018. http://www.mycobank.org/MB/12017111.15.18