io6 FIELD COLUMBIAN MUSEUM BOTANY, VOL. i. 



P. cornicola (D. C.) Rabh. 



On Cornns florida, Nov. 5, 1894 (Nut tall, 1748, 638). 



P. Cookei Sacc. 



On leaves Magnolia acuminata, Aug. 9, 1894. Sporules 15 to 2o> 

 x 6 to 7.5 fj. (Nuttall, 1655, 577). 



P. Tiliae Sacc. 



On leaves Tilia Americana, Aug. 10, 1894. Sporules 7 to 8 x 

 2.5 to 3 fj. (Nuttall, 1672, 579). 



P. Chionauthi Thum. 



On Chionanthus Virginica, Aug. 10, 1895. Spots darker than in 

 type (from Portugal). Spores round or oval, 5 //. or 7.5 x 5 >t 

 (Nuttall, 1833, 724). 



P. liriodendrica Sacc. 



On leaves Liriodendron Tulipifera, June 16 and Oct. 29, 1894. 

 Sporules 7.5 to 10 x 2 to 3 //. (Nuttall, 1571). P. Liriodendri,&.. 



P. Ulmi West? 



Onleaves Ulmus pubescens, July 9, 1894. Sporules -f- J 6 x 7.5 /* 

 (Nuttall, 1631, 563). 



P. phomiformis Sacc. 



On leaves Quercus Prinus and Q.alba, July 4, 1894. Sporules 

 15 to 30 x 6 to 8 >j. (Nuttall, 1585). 



P. Castanese E. & E., Proc. Phila. Acad., 1894, 357. 



TYPE HABITAT: On leaves Castanea pumila (not on Castanea vesca 

 as originally published), July 26, 1 894 (Nuttall, discov. 1639, 570). 



Spots orbicular, rust-color, with narrow dark-shaded margin. 

 Perithecia epiphyllous, scattered on the spots, dark, semierum- 

 pent, 100 fjL diameter, often collapsing. Sporules oblong, hyaline,. 

 5 to 7 x 2 to 2.5 p. 



P. Lappse Sacc. 



On Arctium Lappa, July 20, 1894 (Nuttall, 1613). 



P. Dioscorese Cooke. 



On leaves Dioscorea villosa, June 29, 1894 (Nuttall, 1570). 



P. opaca E. & E. sp. nov. 



TYPE HABITAT: On leaves of Ilex opaca. Oct. 5, 1895 (Nuttall^ 

 discov., 1881). 



Spots mostly marginal or terminal, of irregular shape, i to 2 

 cm. across, dirty-white, with a raised subferruginous narrow bor- 

 der. Perithecia evenly scattered, subepidermal, sublenticular, 

 black, raising the epidermis into pustules, 200 //diameter. Spor- 

 ules elliptical, hyaline, 3x1.5 ,. 



Differs from P. Ilicis E. & E. only in its minute sporules. 



PHOMA Fries. 



P. - - sp. 



QnOpulaster opiilifolius, May 7, 1894 (Nuttall, 1510, 494). Spores- 

 7 to 10 x 2.5 to 3 p.. 



