382 PLANT DISEASES 



Sclerotinia tuberosa, Fckl., Symb. Myc., p. 3^1. 

 Ascophores 2-6, springing from an irregularly elliptical 

 sclerotium, up to 3X1*5 cm. buried in the ground, ex- 

 ternally black, inside white ; ascophore at first pear-shaped 

 and closed, then funnel-shaped, finally almost plane, bright 

 brown, 1-3 cm. across; stem slender, 2-7 cm. long; ascus 

 cylindrical; spores elliptical, 15-18x6-7 /x; paraphyses 

 septate, slightly thickened upwards. 



Sclerotinia trifoliorum, Erik., Kgl. Landtbr. Ak. HandL, 

 1880, No. i. Apothecia usually solitary, springing from a 

 small black sclerotium, at first closed, then expanding, 

 yellowish-brown, i-io mm. across; stem slender, 3-28 mm. 

 long; asci cylindrical, 160-180 x 12-14 /*; spores elliptical, 

 ends obtuse, 16-18x8-9 /x; paraphyses slender, septate, up 

 to 7 fj. thick at the enlarged apex. 



* * * Conidial form only known. 



Sclerotinia galanthi, Ludw., Lehrb. d. nied. Krypt., 

 p. 355. Ascigerous condition unknown. 



Conidial stage (B.otrytis (Polyactis) galanthina, B. and 

 Br.). Forming a grey mould on dying leaves and flower- 

 spathes; hyphae shortly branched upwards, coloured, 

 branchlets thickened at the tips; conidia obovate 15-18 X 

 lo-n //-, forming heads, springing from slender sterigmata. 

 Numerous small black sclerotia are formed on the dead 

 parts of the host, and in the bulb scales. 



Sclerotinia douglasii, Massee ; Botrytis douglasii, 

 Tubeuf, Beitr. z. Baumkr., 4, tab. i ; Sacc., Syll. x. 536. 

 Conidiophores brownish, passing through the stomata, 

 solitary or fasciculate, branched towards the summit, almost 

 continuous, branchlets dilated and denticulate at the 



