366 PLANT DISEASES 



ampelicida Engelm.). Conceptacles innate, subglobose, 

 mouth piercing the matrix ; spermatia hyaline, cylindrical, 

 slightly constricted at the centre, i'5 X '5 /^, borne on very 

 slender conidiophores. Germination unknown. 



Pycnidia ( = P/i0ma uvicola, Berk, and Curtis). Con- 

 ceptacles indistinguishable from those of the spermogonia ; 

 conidia hyaline, elliptical, variable in size, 6-9 x 3-4 /*. 



Perithecia. These are the conceptacles of the Photna 

 stage, which produce asci the following season ; asci 

 clavate, obtuse, narrowed below, straight or slightly curved, 

 65-70x10-11 /A; spores 8, continuous, hyaline, slightly 

 obovate, 12-15x6-7 /x; paraphyses absent. 



Spores \-septate^ hyaline. 



Sphaerella, Ces. and Ue Not. Perithecia membran- 

 aceous, subglobose or depressed, covered by the epidermis 

 or erumpent, mouth indented or shortly papillate; asci 

 8-spored ; spores elongated, i -septate hyaline, or very 

 slightly tinged ; paraphyses absent. 



Sphaerella fragariae, Sacc., SylL, ii. p. 505. Perithecia 

 gregarious, often circinating, globose, black, innato-erump- 

 ent, seated on pale spots surrounded by a purple ring 

 previously occupied by the conidial form 90-130 fj. diam. ; 

 asci oblong, 8-spored, 40 //, long; spores i-septate, slightly 

 constricted, hyaline, 15x3-4 /*. 



Conidia {Ramularia tulasnei, Tul.). Conidiophores 

 springing in tufts from the whitish, bordered spots ; conidia 

 narrowly elliptic-oblong,, continuous, or i-3-septate, variable 

 in size, 20-50 x 2-5-4 /x, hyaline. 



Spermogonia. Conceptacles resembling the perithecia in 

 form, rather smaller, and mixed with the latter, containing 

 myriads of ovoid spermatia about 3 ^ long. 



