376 PLANT DISEASES 



thecia crowded, variable in form; asci cylindric-clavate, 

 110-150X16-18 /x; spores obovate, hyaline, i-septate, 

 basal cell much the smaller of the two, 15-20x8-10 /x ; 

 pycnidia resembling the perithecia, containing elliptical, 

 pale yellow, 3-septate stylospores, 10-12x6-7 /j. ; sper- 

 mogonia also similar to perithecia, containing exceedingly 

 minute spermatia. 



Plowrightia ribesia, Sacc, Sy//., ii. p. 635 (1883). — 

 Stroma transversely erumpent, convex, black, minutely 

 granular with the ostiola, up to 2 mm. long ; loculi 

 occupying the periphery, minute; asci 85-100X12-14 /j. ; 

 spores 8, distichous, elongato-fusoid, slightly curved, un- 

 equally i-septate, yellowish-white, 18-20x5-6/*. 



Hysteriaceae. — -Ascophore erumpent, innate, or super- 

 ficial, elliptical or linear, or vertical and compressed, 

 carbonaceous or membranaceous, dehiscing by a long, 

 narrow slit, black or blackish-brown, disc not exposed at 

 maturity ; asci 4-8-spored ; spores hyaline or coloured, 

 continuous or septate ; paraphyses usually present. 



Lophodermium, Chev. — Perithecia innate, elongated, 

 membranaceous, dehiscing by a longitudinal slit ; asci 

 clavate or cylindric-clavate, 8-spored ; spores hyahne, 

 filiform guttulate, almost as long as the ascus, arranged in 

 a parallel fascicle ; paraphyses filiform. 



Lophodermium macrosporum, Rehm, Krypt.- Flora, 

 p. 45. — Apothecia black, elliptical, arranged on either side 

 of the nerve ; asci clavate, apex narrowed, 100X15-21 /*; 

 spores needle-shaped, continuous, 75X1 "5/*; paraphyses 

 filiform, apex hooked. 



Lophodermium nervisequum, Rehm, Krypt.-Flora, 



