

A DISEASE OF PINES CAUSED BY CRONARTIUM PYRIFORME. 



fig. 4) from Colorado, some of the seciospores are very short and 

 slightly acuminate, while many are ellipsoid or even globoid (PL I, 

 fig. 3). In specimens on Pinus pungens from Pennsylvania many of 

 the spores are nearly twice as long as those from Pinus contorta, 

 the acumination is very marked, and the spores are rarely ellipsoid 

 (PI. I, fig. 2). 



Peck's type material of Peridermium pyrijorme is in the New 

 York State Museum, at Albany, N. Y. It consists of a split branch 

 4 cm. long, 1 cm. thick at one end and 0.5 cm. thick at the other; 

 the weak, fragile peridia barely protrude beyond the bark. The 

 split surface of the twig is glued to the yellow paper bearing one of 

 the legends. The specimen is in fairly good condition and most of 

 the essential characters, both macroscopic and microscopic, can be 

 determined from it. What appears to be the other half of this speci- 

 men is at the New York Botanical Garden, Bronx Park, N. Y. ; but 

 it is much insect eaten and but little can be determined from it. 



The type material at Albany bears the following legends on the 

 box: "Peridermium pyriforme, Newfield, N. J. Ellis #2040." On 

 the original wrapper is "Peridermium pyriforme on pine limbs in 

 the spring, Newfield, N. J. .0015-.0025. No. 2040 Ellis." This 

 legend is in two parts. The name is in Peck's handwriting, with a 

 drawing of a spore and size of spores in pencil, while the host, loca- 

 tion, and number of the specimen are in ink and are in Ellis's hand- 

 writing. The word "type" is not in the original legend. The fol- 

 lowing is Peck's original description of Peridermium pyriforme (10) 

 and his remarks on the same : 



Peridia erumpent, large, white when evacuated, the cells subrotund, with a paler 

 margin, marked with radiating striations, spores obovate, pyriform, or oblong- 

 pyriform, acuminate below, .0015-.0025 inch long. 



Bark of pine branches. The specimen is labeled "Newfield, N. J.," but Mr. Ellis 

 informs me that it may have been collected in Georgia and placed by accident among 

 his New Jersey specimens. 



In the dried specimens the peridia are mostly compressed, about one-fourth of an 

 inch long, and scarcely exserted above the surface of the bark. The spores are pale 

 yellow, but probably they are more highly colored when fresh. The acumination is 

 generally acutely pointed, and it is sometimes so elongated as to make the spore 

 appear clavate. It is one of the most distinctive features of the species. 



SYNONYMY AND DESCRIPTION OF THE FUNGUS. 



Cronartium pyriforme (Peck) Hedge, and Long, 1914, Alternate Stage of Peridermium 



Pyriforme. 



Cronartium asclepiadeum thesii Berk., 1845, in Lond. Jour. Bot., v. 4, p. 311. 

 Peridermium pyriforme Peck, 1875, in Bui. Torrey Bot. Club, v. 6, No. 2, p. 13. 

 Caeoma comandrae Peck, 1884, in Bui. Torrey Bot. Club, v. 11, No. 5, p. 50. 

 Cronartium thesii (Berk.) Lagerh., 1895, in Troms0 Mus. Aarsh., v. 17, p. 94. 

 Peridermium betheli Hedge, and Long, 1913, in Phytopathology, v. 3, No. 4, p. 251. 



Pycnia unknown. 



