Fistulina hepatica

Scientific name:   Fistulina hepatica Schaeff.: Fr.
Derivation of name:   Fistulina means " with small,
hollow tubes"; hepatica means "liver" in reference to the
similar appearance of this fungus to the liver.
Synonymy:  
Common names:   Beefsteak polypore; Ox-tongue.
Phylum:   Basidiomycota
Order:   Agaricales
Family:   Fistulinaceae
Occurrence on wood substrate:  Saprobic, weakly
parasitic; solitary or in overlapping clusters on deciduous
trunks, stumps, and logs, particularly oak (Quercus); July
through November.  
Dimensions:  Caps 7-25 cm wide; stalks (if present) 2.5-
7.5 cm long; lateral to eccentric.   
Upper surface:  Blood-red when young to brownish-red
with age; sticky when moist, finely roughened.
Pore surface: Whitish to yellowish, becoming reddish-
brown in age or with bruising; pores 1-3 per mm.
Edibility: Edible, tart or citrus-like.
Comments:  The flesh of this polypore is off-white to
pinkish, with streaks of red. It exudes a red juice. It looks
like a piece of raw meat! Uniquely, the tubes of this
polypore fungus, while closely packed, are free from each
other (use hand lens).

More information at MushroomExpert.com:   

Figure 1. Upper surface of the Beefsteak polypore.
Photo © Pam Kaminski.

Figure 2. Lower surface of the Beefsteak polypore.
Photo © Pam Kaminki.


Figure 3. A young specimen with a reddish juice oozing out
of the cap.

Figure 4. This section through a mature cap shows a thin
gelatinous top layer, a thick pinkish to reddish meat-like
fleshy layer with paler streaks (resembling marbled meat),
and the layer of tubes at the bottom.


Figure 5. A reddish juice can be squeezed out of this fleshy
fungus.


Figure 6. Closeup of pore surface of a young specimen.
Photo © Pam Kaminski.

Figure 7. At maturity, the individual tubes of the tube layer can
be seen. Unlike other polypores, the tubes of Fistulina
hepatica are not connected to each other. Fistulina means
"with small, hollow tubes or pipes."