E-Flora BC: Electronic Atlas of the Flora of British Columbia

Summary:
Pycnoporus cinnabarinus is a red orange bracket-like or shelf-like fruiting body on hardwood, with a vermilion pore surface.

It is found in BC, WA, OR, ID, AB, MB, NB, NF, NS, NT, ON, PE, PQ, AK, AL, AR, AZ, CA, CO, CT, DE, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, NH, NJ, NM, NY, OH, PA, SC, TN, UT, VA, VT, WI, WV, WY, and circumglobal, (Gilbertson)

Cap:
up to 7cm x 13cm x 4cm, bracket-like or bent outward from pore surface growing flat on wood to form shelf-like cap, dimidiate [roughly semicircular] to elongated, leathery when fresh; "ochraceous salmon to apricot orange", becoming pale when old or blackening, not zoned; bald, (Gilbertson), 3-10cm across, semicircular to kidney-shaped; bright cinnabar red to orange; roughened, wrinkled, (Phillips), deep orange red, at first slightly pubescent [downy], fairly wrinkled, with faint zonation toward margin, (Lincoff(1)), orange to orange-red (Breitenbach)

Flesh:
up to 1.5cm thick, soft, fibrous to corky, zoned; red to pale orange, (Gilbertson), tough, leathery, (Phillips)

Pores:
3-4 per mm, circular to angular, with thick walls that may become thin and torn; red (English red to coral red), retaining the red colors longer than cap, (Gilbertson), fine, angular; colored as cap; tube layer 0.1-0.6cm, (Phillips), tubes occasionally in 2-3 layers (Lincoff(2)), pores small, circular, pubescent; vermilion; tube layer 0.1-0.3cm, blood red, (Lincoff(1)), deep orange-red (Breitenbach)

Stem:
none; when wood broken open, orange-red mycelium is apparent, (Breitenbach)

Chemical Reactions:
flesh becomes yellowish then colorless in KOH, (Gilbertson), flesh black with KOH (Phillips)

Odor:
negligible (Lincoff(1))

Taste:
negligible (Lincoff(1))

Microscopic:
spores 6-8 x 2.5-3 microns, cylindric, slightly curved, smooth, inamyloid, colorless; basidia 4-spored, 18-25 x 5-7.5 microns, clavate, with basal clamp; cystidia absent, hyphal pegs frequent; hypha trimitic, generative hyphae of context 3-5 microns wide, "thin-walled, with clamps, rarely branched", skeletal hyphae of context 2.5-10 microns wide, "thick-walled, rarely branched, nonseptate", binding hyphae of context 1.5-5 microns wide, "much branched, thick-walled, nonseptate"; hyphae of trama similar, "hyphal contents in some areas of tramal tissue with strongly dextrinoid contents", (Gilbertson), spores 5-6 x 2-2.5 microns (Phillips, Lincoff(1), Lincoff(2)), spores 4-5.5 x 2-2.5 microns, elliptic, smooth, inamyloid, colorless, (Breitenbach)

Spore Deposit:
white (Phillips)