ADDENDA 565 



melon, and mushroom beds. I have seen a barrow-load of 

 these sclerotia taken from a comparatively small-sized cucum- 

 ber frame. The sclerotia are buried in the soil, and if 

 allowed to remain, produce simple or branched, upright, fertile 

 stems above ground. These black stems are usually crooked 

 and wavy, and the tip of each branchlet is terminated by an 

 irregularly swollen knob bearing numerous perithecia in its 

 substance, the mouths of which project slightly and give 

 a papillate appearance to the surface of the knob. The asci 

 in the perithecia each contain eight opaque, brown, almond- 

 shaped continuous spores, 40-50 fj. long. 



When the fungus is present there is no cure; and as it 

 spreads very rapidly, the only course is to remove the soil 

 completely and replace by fresh soil mixed with a sprinkling 

 of lime, or preferably with kainit. 



Apple bark fungus (Valsa ambient. Fries.) has been 

 shown by Dr. M. C. Cooke to seriously affect the living 

 bark of apple-trees, although the fungus is usually a pure 

 saprophyte. The conidial form of the fungus first appears 

 under the form of golden yellow tendrils oozing out of the 

 living bark. These tendrils consist of myriads of minute 

 conidia embedded in a gelatinous substance. This form 

 was at one time considered as a distinct fungus called 

 Cytospora carphosperma (Desm.). The ascigerous condition 

 is produced after the bark is dead, and consists of clusters of 

 flask-shaped perithecia arranged in clusters and embedded 

 in the bark ; each perithecium has a long, slender, cylindrical 

 beak which projects beyond the bark, and through which 

 the spores escape. Spores cylindrical, curved, ends rounded, 

 hyaline, i6-i8X3-4/x. 



Cooke, M. C., Futigoid Pests of Cultivated Plants, p. 120. 



Tomato flower rot (Fnsarium solani^ Sacc.) a stage of 

 Nectria solani, Reinke) is often responsible for the non- 

 development and withering of the inflorescence of the 

 tomato plant. As a rule the flowers do not expand, and 

 along with the adjoining portions of the stem, become hairy 

 and brownish. Eventually the conidia of the fungus, under 

 the form of reddish, glairy masses, appear on the surface of 

 the affected parts. 



Parsley rot. Parsley is sometimes seriously injured, more 

 especially when grown in houses, by Sclerotinia libertiana 



