380 PLANT DISEASES 



branched, and with several short, simple, or divided 

 branchlets near the apex, ultimate branchlets spinulose, 

 septate, slightly constricted at the septa, smoky-brown, 

 200-300 X 1 2-16 p. ; conidia broadly elliptical or subglobose, 

 apiculate, almost colourless, 10-12 /* diam., forming 

 globose heads. 



Sclerotinia bulborum, Rehm, Krypt.-Flora, p. 819. 

 Ascophores 1-3 in number, springing from an irregularly 

 elliptical sclerotium, blackish externally, 8-12 mm. diam.; 

 at first closed, then expanding, brown, 3-5 mm. ; stem 

 slender, 10-15 mm - l n gj asc i narrowly cylindrical; spores 

 8, elliptical, 14-16x7-8 /*; paraphyses slender. 



Botrytis form. Compact, brownish-buff tufts, tips of 

 fertile branchlets spinulose, each spine bearing a smooth, 

 hyaline, elliptical, apiculate conidium, 9-10X7 /*. 



Sclerotinia oxycocci, Wor., Mem. Acad. St. Petersb., 1888, 

 p. 28, pi. vii. Ascophore slenderer than in S. vacrinii, 

 stem slender, crooked, 5 mm. long, fixed to the ground by 

 rhizoids, springing from a fruit sclerotium ; asci cylindrical, 

 spores 8, of two different sizes, 4 measuring 12-14x6^ 

 and 4 measuring 8x3-4^; paraphyses clavate, tips brown. 



Conidia Q#**M-Uke, forming a whitish mould on leaves 

 and slender branchlets ; broadly elliptical, 25-28 X 16-22 p. \ 

 disjunctors present. 



Sclerotinia urnula, Rehm, Krypt.-Flora Disc., p. 804 

 (=S. vaccinii, Wor.). Ascophore solitary, rarely two 

 from a fruit-sclerotium, chestnut-brown, 5-15 mm. broad, 

 stem usually crooked, slender, 2-10 cm. long, fixed to the 

 ground by rhizoids near the base; asci cylindrical, 150- 

 180x7-8 /x, 8-spored, spores of two sizes, elliptic-oblong, 

 ends obtuse, the four largest 12-15x5-6 ft, the other four 



