6 



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 

 (PI. I, fig. 2) are practically identical, since the range in size for 20 

 spores of the type is 19 to 25.6 // by 41.6 to 73.6 fi 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 /* by 42 to 73.6 p. with an average for 20 spores 

 of 23.1 by 59.1 //. 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. 



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 

 echinata, P. rigida, and P. virginiana. None of these were found by 

 him to be diseased with the Peridermium of Cronartium pyriforme. 



