38o 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 /x ; conidia broadly elHptical or subglobose, 

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

 globose heads. 



Sclerotinia bulborum, Rehm, Krypf. -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 "^^- ^oi^g; ^sci narrowly cylindrical; spores 

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



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

 fertile branchlets spinulose, each spine bearing a smooth, 

 hyaline, elliptical, apiculate conidium, 9-10x7 /x. 



Sclerotinia oxycocci, Wor., Mem. Acad. St. Fetersl?., 1888, 

 p. 28, pi. vii. — Ascophore slenderer than in S. vacci?in, 

 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 /x 

 and 4 measuring 8 X 3-4 /x ; paraphyses clavate, tips brown. 



Conidia Oidiu/?i-\\\ie, forming a whitish mould on leaves 

 and slender branchlets ; broadly elliptical, 25-28 X 16-22 /x ; 

 disjunctors present. 



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

 {=^S. vaccina, 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 /x, the other four 



