424 Arthur and Kern: Peridermium 



Lamb.), Omer, Arenac County, Michigan, August, 1900, C. F. 

 Wheeler (specimen in herbarium U. S. Dept. Agric). 



On branches of Pinas echinata Mill. (P. mitis Michx.), Eureka 

 Springs, Arkansas, May 29, 1906, H. von Schrenk ; Alabama, 

 other data wanting (specimen in herbarium of New York Bot. 



Garden). 



On branches of Pitiits Taeda L., Columbus, Mississippi, April 



5, 1896, 5. M. Tracy (specimen in herbarium of New York Bot. 

 Garden). 



ponder 



H. W. Harkn 



Bot. 



Garden. 



A widespread and characteristic species, more common south- 

 ward, now known to be the aecial stage of Cronartium on the 

 several species of Quercus, as demonstrated by Dr. C. L. Shear,* 

 and verified by the writers just as the manuscript goes to press. 



The type collection consists of a globoid gall about 2 cm. in 

 diameter, accompanied by a water-color sketch, showing a small 

 lateral branch bearing a sheath with two leaves, now lost from the 

 specimen. This is the only collection reported from the state 

 of New York. The village of Center is now called Karner, and 

 the pine forest is cleared away. 



1 5. Peridermium globosum sp. nov. 



0. Pycnia unknown. 



1. Aecia caulicolous, on globoid swellings, 2-3 cm. across, 

 individual sori scarcely discernible but confluent over almost the 

 entire area giving the whole a crinkled appearance, pale-yellow 

 fading to white ; peridia circumscissile, falling away in very large 

 flakes or sheets of uneven thickness, varying from 1 to 2 cells, 

 outer surface verrucose, inner more coarsely verrucose, cells lan- 

 ceolate, often very slender, placed radially, walls thick, with radial 

 striations, somewhat tuberculate, lumen moderately small ; aecio- 

 spores ellipsoid, 16-22 by 26-31 fi y wall colorless, rather coarsely 

 verrucose with smooth area extending from base up one side, 2-3 

 ft thick, about r fi thicker on smooth side. 



On Strohus Strobus (L.) Small (Pi mis Strobns L.), Lone Rock, 

 Wisconsin, May 21, 1890, & S. Goff. Only one specimen seen, 



*Jour. Myc. 12: 89. 1906. 



