403 
3. PERIDERMIUM CEREBRUM Peck, Reg. Rep. 25: 91. 1873. 
Peridermium pineum Schw. Trans. Amer. Phil. Soc. 4: 294. 
1835. Not Lk. 3 Ob. 
? Peridermium pyriforme Peck, Bull. Torr. Bot. Club, 6: 13. 
1875. : 
This stem-inhabiting species was first mentioned by Schwein- 
itz in Syn. Fung. Carol. Wo. 456 and afterward in Syn. Fung. Bor. 
Am., where he describes it as follows: “In Pennsylvania prope 
Philadelphia et alibi non rarum. Specimina ampla, pedalia in 
ipso trunco Pini inopis mihi obvia, analogon praebuerunt Gym- 
nosporangis juniperini.” Later the species was collected by Lint- 
ner at Center, New York, on Pinus rigida and described by Peck 
as Peridermium cerebrum. Professor Peck informs us that the 
species is not common in eastern New York. We have seen the 
type specimen, which is not different from the forms common 
about Washington on Pinus Virginiana and farther south on P. 
echinata, except that the gall is larger in proportion to the size 
of the stem. . 
Peck described later a second species sent him by Ellis either 
from New Jersey or Georgia. Of this we have not been able to 
see the type, but its striking characteristic of pyriform spores men- 
tioned in the description we have found in both forms of P. cere- 
brum as they occur in the South. A form distributed by Ellis, N. 
A. Fungi, 1021, «On seedlings of Pinus inops Ait,” shows micro- 
Scopic characters similar to this species, but in the set examined 
the fungus appears to make only a slight swelling and that totally 
unlike the normal one produced on P. Virgintana. There may ; 
have been some error in the determination of the host. This mat- — 
ter has been left for later consideration. 
Specimens have been examined as follows: 
On Pinus rigida, New York (Peck); New Jersey (Ellis); Massa- 
chusetts. (Underwood); the last named specimen was in the 
form of a convex swelling at the base of a large tree; the others 
are of the typical globose form. 2 
On Pinus Virginiana. Virginia (Galloway); Alabama (Under- 
W0od) ; to these should be added the Schweinitzian reference to 
Pennsylvania above cited; all these forms are of the globose — : 
type. ee . : 
