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WEST VIRGINIA GEOLOGICAL SURVEY CLASTEROSPORIUM Sz. C. CORNUTUM E, & E., Field Mus. Bot., 1:92 (1896). TYPE HABITAT: On decaying wood, Oct. 21, 1895 (Nuttall, discov. 1883). Hyphæ prostrate, septate, branched, brown, about 6 H diameter, effused in black velvety patches 1 to 2 chi. across. Conidia in pairs or threes, horn-shaped, 10 to 14 septate. 100 to 225 x 14 , 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 hyphæ, appearing at first as a simple nodule or tubercle on the side of the thread. Allied to C. Hirudo Sacc., but that has solitary multisep tate (55 to 65) conidia and evanescent hypha. C. SIGMOIDEUM E. & E., Bull. Torr. Club, 24:472 (1897). Hyphæ effused, crooked, septate at intervals of about 15 Hd forming an olive-black stratum on the bark for many cm. in extent, subcespitose, 300-400 x (6-74; conidia broad-fusoid, siginoid (ends curved in opposite directions), 4 (exceptionally 5) septate and slightly constricted at the septa, intermediate cells brown, end cells hyaline, 40-70 X 12-15 , mostly subtruncate above. On dead limbs of Castanea. Fayette, near Nuttallburg, March, 1896 (Nuttall, 819). HELMINTHOSPORIUM Link. H. PERSISTENS Cooke. On branches of Acer in pine woods, alt, 2,000 ft, March 9, 1894. Conidia 75 to 150 x 10 to 15 # (Nuttall, 1421, 392). H. MACROCARPON Grev. On decorticated limbs Platanus occidentalis. Oct. 6, 1895 (Nuttall, 1887). On Magnolia Fraseri, Nov., 1895. H. FOLLICULATUM Corda. On Zea Mays, Aug. 2, 1895 (Nuttall, 1835). H. ATTEXUATUM Peck & Cooke. On dead log, Short Creek, alt. 1,800 ft., June 10, 1894 (Nuttall, 1547). H. SEPTEMSEPTATUM Peck, On Magnolia Fraseri, June 20, 1894 (Nuttall, 1574, 534). H. BRACIIYPUS E. & E., Field Mus. Bot., 1:92 (1896). TYPE HABITAT: On dry wood of old log. Oct. 8, 1895 (Nuttall, discov. 1873, 757). Effused in brownish-black patches of several centimeters in extent, velutinous, thin. Prostrate hypha only sparingly branched, obscurely septate, crookesl; fertile hyphæ ces Digitized by Google
