ine. It is found on dead pine, spruce,
balsam, and other conifers. It resembles Fomes leucophaeus but is
somewhat stouter and does not have as hard and firm a crust. The young
growth is at the margin, and is whitish or tinged with yellow, while the
old zones are reddish. The tube surface is whitish-yellow or yellowish.
This is frequently called Polyporus pinicolus. (Swartz.) Fr.

_Fomes igniarius. Fr._

[Illustration: Figure 349.--Fomes igniarius.]

This is rather a common species in our state; black or brownish-black in
color, somewhat triangular in shape, and frequently hoof-shaped. The
zones indicating the yearly growth are plainly marked, and the tubes are
quite long and of a dark brown color. Their growth is rather slow, and
it requires years to produce some of the moderate sized specimens. Prof.
Atkinson of Cornell University found a specimen which he believed to be
over 80 years old.

This is called by many authors Polyporus igniarius (L.), Fr. Murrill
calls it Pyropolyporus igniarius. This plant is widely distributed over
the United States, and is met frequently in every wood in Ohio.

_Fomes fraxinophilus. Fr._

[Illustration: Figure 350.--Fomes fraxinophilus.]

Fraxinophilus means ash-loving; rather common in this country, but does
not grow in Europe.

The pileus is between corky and woody, smooth, somewhat flattened, at
first zoneless; white when young, then reddish-brown, white around the
margin; at first even, then concentrically sulcate, pale within.

The tubes are short, pores minute, rusty-red but covered from the first
with a white pubescence and continuous with the margin; the spores
nearly round, 6-7u.

The specimens in Figure 350 were found in Haynes' Hollow on a living
ash, growing at intervals of five or six feet, one above another, to a
height of thirty feet.

_Trametes. Fr._

In case of the genus Trametes the hymenophorum descends into the trama
of the pores without any change, and is permanently concrete with the
pileus. The pores are entire. There are, however, a few of the Polypori
which are quite thin that have the trama of the same structure with the
hymenophorum. These have been separated by Fries and have been called
_Polystictus_. They are distinguished by the fact that the pores develop
from the center out and are perpendicular to the fibrillose stratum
above the hymenophorum while in the genus _Trametes_ the hymenophorum is
not distant from the rest of the pileus.