40 Bulletin 313 



CoRDYCEPS MiLiTARis (L.) Link. — On buried or partially buried 

 insect pupa. Seaver (Mycologia, v. 3, p. 209, 1911) describes tliis 

 species as follows : "Sclerotia formed in the pupae of insects, com- 

 pact, white, conidial stage (Isaria) rising from the sclerotium, 

 consisting of a slender stalk, and a white, floccose, feather-like 

 head ; stromata at maturity consisting of a sterile stem and fertile, 

 clavate head, usually a simple but more rarely forked or branched, 

 the whole often attaining a height of 4-5 cm. but often much shorter, 

 bright-orange; pzrithecia thickly scattered or crowded, for the most 

 part with the necks protruding, or superficial (especially in weatli- 

 ered specimens) ; asci cylindric ; spores filiform, nearly as long as 

 the ascus, many-septate, breaking apart at the septa, giving rise to 

 numerous subellipsoid segments 2-3 fi long." 



162. Infected larva and mature plant. 163. Part of ascus containing spore, 

 1/12. 



CoRDYCEPS SPHINGUM (Schw.) B. & C. — On dead insect larvae 

 within the cocoon. Seaver (Mycologia, v. 3, p. 216, 1911) describes 

 this as follows: "Stromata numerous, as many as thirty often 

 springing from a single sclerotium, very slender and thread-like, 

 about 5 cm. high and 1 mm. in thickness, cinerous, smooth or 

 slightly pruinose. enlarged at the base, more or less bent above; 

 perithecia subsuperficial, subconic 25-150 x 200-225 fx, brownish, 

 asci elongate, cylindric ; spores filiform, as long as the ascus, about 

 2 IX thick)' 



164. Infected larva in cocoon and mature plant. 165. Ascus containing 

 spores, 1/12. 



Plowrightia morbosa (Schw.) Sacc. — On the stems of plums 

 and cherries. Causes black, unsightly, wart-like enlargements of 

 the affected parts and frequently results in death. The young knots 

 are formed in the spring and are greenish and bear the conidio- 

 phores and conidia {Cladosporium). The conidiophores are erect, 

 simple, septate and 40-60 x 4-5 /*; the conidia are light brown, obo- 

 vate, unicellular and about 6-8 x 2-5 /*. The mature knots are 

 black, tubercular, conspicuous, extremely variable in size, the peri- 

 thecia are formed late in the summer or early winter, scattered, 

 sometimes suppressed; asci about 120 [x in length, containing 8 

 spores which are obliquely uniseriate, and 16-20 x 8-1 p.; paraphyses 

 present. (See Ann. Glycol., v. 13, p. 663, 1915.) 



166. Infected cherry twigs showing conidiophore stage. 167. Conidiophores 

 and spores, 1/12. 168. Infected cherry twig in advanced stage. 169. Cross- 

 section of stroma showing perithecia. 170. Asci and ascospores, 1/12. 



