134 ABSTRACTS 



ism was found to have a wider range of conditions suitable for growth 

 than for reproduction. The quantity of food stuffs necessary for 

 growth is extremely minute. Pycnidium production requires more 

 food, but the meager amount present in distilled water is sufficient to 

 allow the production of a few pycnidia. Magnesium sulphate and 

 potassium dihydrogen phosphate in very dilute solutions furnish 

 the necessary mineral elements for growth and reproduction. The 

 carbon supply may be taken from a wide range of compounds of alco- 

 holic structure. Carbohydrates furnish food material in the most 

 available form, and of these xylose and maltose produce the best growth. 

 The nitrogen assimulation is greatly influenced by the type of carbon 

 nutrition. The influence of physical conditions on growth and re- 

 production is also shown. The general problem of the paper was to 

 study the effect of environmental factors upon Plenodomus fuscoma- 

 culans especially as they influenced growth and reproduction. — S. H. A. 



