124 FIELD COLUMBIAN MUSEUM BOTANY, VOL. i. 



so as to form an irregular circle about 2 mm. across, but this line 

 does not penetrate the bark. Sporules navicular-oblong, hyaline, 

 obtuse, 10 to ii x 4 to 5 /z with i to 2 large nuclei. Basidia 

 slender-cylindrical 15 to 20 x 1.5 /;.. Mass of exuded sporules 

 flesh color. 



M. Rhois (B. & C.) Sacc. 



On fire killed Rhus hirta, June 20, 1895 (Nuttall, 1575, 537). 



M. platanicolum E. & E., Proc. Phila. Acad., 1894, 372. 



TYPE HABITAT: On limbs Platanus occidentalis, April 24, 1894 

 (Nuttall, discov. 1485, 467). 



Acervuli subcutaneous, vesiculoid, pale, i mm. diameter, rais- 

 ing the ruptured epidermis into pustules but not erumpent. 

 Sporules oval or oblong-ovate, hyaline, nucleate at first, 10 to 12 

 x 5 to 6 /z, on stout basidia. 



M. seriatum E. & E., Proc. Phila. Acad., 1894, 372. 



TYPE HABITAT: On bark of Acer sp. , June, 1894 (Nuttall, dis- 

 cov. 1552, 523). 



Nuclei pallid, orbicular, about i mm. diameter, seated on the 

 surface of the inner bark; surrounded by a thin layer of smoky col- 

 ored radiating hyphae, from the inner extremities of which the 

 botuliform or oblong, 6 to 8 x 2 to 2.5 //. hyaline conidia are 

 produced. The nuclei are seriately arranged, and the pale flesh- 

 colored, flattish cirrhi are erumpent through narrow, longitudinal 

 cracks in the bark. 



COLLETOTRICHUM Corda. 



C. LlNDEMUTHIANUM (S. & M.) Scrib. 



On pods of Phaseolus cult. "Wax, Butter Bean." Monongalia 

 Co., near Morgantown, 1891 (MillspaugK). 



C. - - sp. 



On Sassafras Sassafras, Oct. 15, 1894. Sporules 8 to 18 x 4 

 to 7 ii. (Nuttall, 1714, 602). 



C. lineola Corda. 



On Zea Mays, Aug. 10, 1895 (Nuttall, 1834, 726). 



CYLINDROSPORIUM Ung. 



C. Cratsegi E. & E., Proc. Phila. Acad., 1894, 372. 



TYPE HABITAT: On leaves Cratagus sp., July 26, 1894 (Nuttall 

 discov. 1640, 571). 



Leaves more or less mottled with rusty red, at length uniformly 

 of this same color. Acervuli innate, erumpent on both sides, and 

 whitening the surface of the leaf with abundantly discharged co- 

 nidia, which are 75 to 100 x 3 to 3.5 /JL, nearly straight or more or 

 less undulate and curved, nucleate, and faintly 3 to 5 septate. 



C. Toxicodendri (Curtis) E. & E. Proc. Phila. Acad., 1893, 460. 



On leaves Rhus radicans, June 29, 1894. Sporules, largest, 

 50 x 3 IL (Nuttall, 1568). 



