8 
BULLETIN 247, U. S. DEPARTMENT OF AGRICULTURE. 
A study of Table II and of figures 1 and 2 of Plate I shows some 
very interesting facts. For instance, the shape and size of the spores 
from the type material (PL I, fig. 1) and those from Pinus pungens 
(PL I, fig. 2) are practically identical, since the range in size for 20 
spores of the type is 19 to 25.6 a by 41.6 to 73.6 ji with an average 
for 20 spores of 23.4 by 58.6/*, and for 20 spores from Pinus pungens 
the range is 19 to 25.6 fi by 42 to 73.6 fx with an average for 20 spores 
of 23.1 by 59.1 a. This close similarity in size and shape would 
indicate that the type may have been on Pinus pungens, but this 
does not seem probable if the type really came from Newfield, N. J. ; 
as Pinus pungens has not been reported from this locality, although 
Britton (4) reports it as abundant 1 mile east of Sergeantsville, in 
Hunterdon County. It is possible that sporadic or introduced 
specimens of Pinus pungens may have been growing near Newfield 
at the time the collection of the type specimen of Peridermium 
pyriforme was made. The alternate stage of the rust, Cronartium 
pyriforme, on Comandra umbellata was collected at. Newfield, N. J., 
by Ellis in August, 1879, and issued by him in North American 
Fungi under the number 1082. This indicates that the type material 
of Peridermium pyriforme came from New Jersey. 
Table II. — Measurements, shape, etc., 
of the seciospores of Cronartium pyriforme. 
.ZEcial host, serial number, 
and locality. 
Measurement (microns'). 
Shape. 
Range in size. 
Average for 
20 spores. 
Acuminatum. 
Pinus pungens: 
15462, Greenwood Fur- 
nace, Pa. 
Pinus sp.: 
Type, Newfield, N. J. (?). 
Pinus ponderosa: 
15556, near Darby, Mont. . 
12467, Wenatcb.ee, Wash . . 
1246S, Rocky Gulch, CaL. 
Pinus ponderosa scopulorum: 
12470, Crook National 
Forest, Ariz. 
Pinus contorta: 
15550 Eldora, Colo 
19 to 25.6 by 42 to 
73.6. 
19 to 25.6 by 41.6 
to 73.6. 
19 to 25.6 by 38 to 
64. 
18 to 25.6 by 3S to 
64. 
20.8 to 25.6 by 35 
to 70.4. 
19 to 27 by 32 to 64. 
15 to 25.6 by 25 to 
45. 
15 to 26 by 25 to 48. 
23.1 by 59.1.. 
23.4 by 58.6.. 
22.4 by 48.6.. 
21.1 by 51.5.. 
23.9 by 54.5.. 
21.8 by 44.3.. 
1S.1 by 40.2.. 
Obovate or pyri- 
form to subcla- 
vate or spatulate. 
Obovate to pyri- 
form or subcla- 
vate. 
Obovate to pyri- 
form or rarely 
ellipsoid. 
Obovate to pyri- 
form. 
do 
Ellipsoid or obo- 
vate to pyriform. 
do 
Often very long 
(PI. I, fig. 2). 
Often very long 
(PL I, fig. 1). 
Often not very pro- 
nounced. 
Do. 
Do. 
Usually very short. 
Usually very short 
(PI. I, fig. 3). 
Usually very short. 
8500, Eldorado Springs, 
Colo. 
20 by 43 
do 
The senior writer, during August, 1914, visited Newfield and several 
other localities in the same region. He found the same species of 
pine here that are known to occur in southern New Jersey and that 
probably were present at the time of the Ellis collection, viz, Pinus 
ecJtinata, P. rigida, and P. virginiana. None of these were found by 
him to be diseased with the Peridermium of Cronartium pyriforme. 
