regular pores and the vein like character of their dissepiments (or
pore walls). Substance slightly gelatinous.

In the plants of Porothelium, irregular papillae take the place of tubes,
and the plants are sub-membranaceous and resupinate, having the habit of
those of Poria.

The genus Merulius has been termed the lowest and most imperfect of the
genera of Polyporei. It presents a soft, waxy spore-bearing surface,
reticulated with obtuse folds. Solenia, by early authors placed in
Discomycetes, thence transferred to Auricularini, and by some authors
associated with Cyphella in Theleporei, now finds place as one of the
genera of Polyporei as given by Saccardo.

The above-mentioned genera, together with Myriadoporus, Ceriomyces,
Bresadolia, Theleporus, Gloeporus, and Cyclomyces, constitute the
Polyporeae of the Saccardian system.

_Myriadoporus_ is a North American genus. It is a form of the genus
Polyporus, but with pores in the _interior_ as well as on the _exterior_
surface. _Ceriomyces_ is generally regarded as a spurious genus. It is
similar to _Myriadoporus_, but with internal pores and only spurious
pores externally. Of _Bresadolia_ Cooke says "there is only one
described species, and of this only one specimen has been found."
_Theleporus_ is an African genus of which only one species is known.
_Gloeporus_ is a form of resupinate Polyporus, except that the
hymenium or pore-bearing surface is gelatinous instead of being firm.
_Cyclomyces_ is a genus with some features of Lenzites; it is leathery.
All of these are more or less coriaceous. None are edible. _Campbellia_
is a new genus. It is _Merulius_ with a pileus and central stem.

The edible Polyporeae are found in the genera Boletus, Strobilomyces,
Gyrodon, Boletinus, Polyporus, and Fistulina. Of these, the first four
genera contain most of the edible species as well as a few which have
been regarded as unwholesome or poisonous.

In the genus Polyporus as now restricted, the species Polyporus
_sulphureus_ Fries is perhaps the one most likely to be selected for
table use, the others becoming very quickly indurated or tough, and this
should be gathered when very young, as in maturity it loses its fleshy
consistency and becomes dry and tough. It is common on old tree stumps
and is often found on the dead wood of living trees, the bright yellow
and vivid orange red tints which characterize the young plant making it
very conspicuous.

It is easily recognized by