38 Bulletin 313 



Typhodium typhinum (Pers.) Seaver. — On grasses. Prevents 

 flowering. Seaver (Mycologia, v. 2, p. 86, 1910) describes this 

 species as follows : "Stroma effused, subfleshy, at first pale, be- 

 coming bright orange, forming sheaths 2-5 cm. in length, about the 

 stems of various grasses ; conidia elliptical, hyaline, 4-5 x 3 /^ ; peri- 

 thecia thickly scattered, partially to entirely immersed, soft mem- 

 branaceous, similar in color to the stroma, with rather prominent 

 ostioltmi; asci cylindrical, very long, 8-spored; spores nearly as 

 long as the ascus, in a close fascicle, about 2 /i, in diameter, many 

 septate." 



153. Infected grass. 154. Longitudinal section of same through stroma. 

 155. Ascus containing spores, 1/12. 



CoRDYCEPs AGARiciFORMiA (Bolt.) Scavcr. — On Elaphomyces. 

 Seaver (Mycologia, v. 3, p. 217, 1911) describes this species as 

 follows : "Stromata occurring singly or in clusters of several each, 

 3-8 cm. high, consisting of a sterile stem and an ovoid or capitate, 

 fertile head, stem uniform in thickness or a little thicker below, 

 fibrous yellowish, becoming nearly black (in dried specimens), 

 smooth head ovoid agariciform, about 1 cm. in diameter, reddish 

 brown becoming nearly black, roughened by the slightly protruding 

 necks of the perithica, perithecia immersed, but prominent, asci 

 very long, cylindric, about 15 ,u thick, spores, filiform, nearly as 

 long as the ascus, finally breaking into segments, subhyaline, fusoid 

 or oblong ellipsoid, with the ends rounded, 20-40 x 4-5 ii." 



156. Mature plant parasitic on another fungus. 157. Part of ascus, 1/12. 

 158. Ascospores. 1/12. 



CoRDYCEPS CLAVULATA Schw. — On the dead scale insects. Seaver 

 (Mycologia, v. 3, p. 314, 1911) describes this species as follows: 

 "Sclerotia formed in the bodies of dead scale insects ; stromata 

 slender, clavate, at first sterile, at maturity with an enlarged clavate 

 fertile head and a slender, sterile stem, the whole 3-4 mm. high, 

 3-8 springing from a single sclerotium ; stem slender, 1-2 mm. 

 long, grayish cinereous, head thicker, darker in color and strongly 

 roughened by the protruding necks of the perithecia; asci clavate, 

 broader near the middle, 8-100 x 8-10 /x; spores much elongate, 

 sub filiform, broader near the base and tapering toward either end, 

 7-8 septate about 50-80 fi long, 3 /j. thick at the broadest point, hya- 

 line." 



159. Tmg bearing infected scale insects. 160. Ascus, 1/12. 161. Asco- 

 spores, 1/12. 



