92 Field Columbian Museum — Botany, Vol. i. 



C. sp. 



On dead decorticated limb Magnolia Fraseri, Sept., 1895 {Nutt- 

 all, 1853, 739). 



A most beautiful velvety black form. 



C. epimyces Cooke. 



On pileus Polyporus varians, Jan. 25, 1894 (Nuttall, 1341). 



CLASTEROSPORIUM Sz. 



C. Cornutum E. & E., sp. nov. 



Type habitat: On decaying wood, Oct. 21, 1895 {Nuttall, dis- 

 cov. 1883). 



Hyphae prostrate, septate, branched, brown, about 6// diameter, 

 effused in black velvety patches i to 2 cm. across. Conidia in 

 pairs or threes, horn-shaped, 10 to 14 septate, 100 to 225 x \\ix, 

 broadest below, gradually tapering above to an obtuse point, 

 curving outward at the base, rising and spreading out above like 

 the horns of an ox. The conidia are but slightly constricted at 

 the septa and are sessile on the hyphae, appearing at first as a 

 simple nodule or tubercle on the side of the thread. 



Allied to C. Hirudo Sacc, but that has solitary multiseptate 

 (55 to 65) conidia and evanescent hyphae. 



HELMINTHOSPORIUM Link. 



H. persistens Cooke. 



On branches of y^r^r in pine woods, alt. 2,000 ft., March 9, 1894. 

 Conidia 75 to 150 x 10 to 15 // {Nuitall, 142 1, 392). 



H. macrocarpon Grev. 



On decorticated limbs jPAr/^;///.? occidejiialis. Oct. 6, 1895 {Nutt- 

 all, 1887). On Mcigiiolia Fraseri, Nov. 1895. 



H. folliculatum Corda. 



On Zea Mays, Aug. 2, 1895 {Nuttall, 1835). 



H. attenuatum Peck & Cooke. 



On dead log. Short Creek, alt. 1,800 ft., June 10, 1894 {Nutt- 

 all, 1547). 



H. septemseptatum Peck. 



On Magnolia Fraseri, June 20, 1894 {Nuttall, 1574, 534)- 



H. brachypus E. & E. sp. nov. 



Type habitat: On dry wood of old log. Oct. 8, 1895 {Nuttall, 

 discov. 1873, 757). 



Effused in brownish-black patches of several centimeters in ex- 

 tent, velutinous, thin. Prostrate hyphae only sparingly branched, 

 obscurely septate, crooked; fertile hyphse cespitose, erect, 40 to 

 50 X 4 to 6 /J., 2 to 3 septate, abruptly constricted at the tips 

 and subtruncate. Conidia terminal, oblong-fusoid, 5-septate 



