LESS IMPORTANT DISEASES. 39 



varying from 22 to 35 /x in length. The basal cell also has a short 

 hyaline appendage 6 to 12 /A long. 



This fungus is quite generally distributed in the cranberry-growing 

 regions. Specimens have been obtained from West Virginia, New 

 Jersey, Wisconsin, Massachusetts, and New York. 



Pestalozzia guepini Desm. is given by Farlow and Seymour 60 as 

 occurring on the cranberry, but a study of that species indicates that 

 our plant is a variety at least, as indicated, and may perhaps be 

 found to be a distinct species. 



The spores of this fungus germinate readily under ordinary labo- 

 ratory conditions in water or culture media. The germ tube almost 

 invariably arises from the basal cell of the spore (PL II, fig. 15, c, d). 

 Occasionally two germ tubes arise, one from each side of the basal cell 

 (PL II, fig. 15, d). The germ tube grows rapidly and soon begins to 

 branch, forming a nearly white mycelium. This covers the culture 

 medium with a thin, rather compact layer. About the time acervuli 

 begin to form, a faint pinkish tinge appears. Acervuli and spores are 

 produced in about ten to twelve days. The acervuli first appear as 

 dark-colored dots. Spores are produced in enormous numbers and 

 spread about the acervuli in irregular black masses. 



This fungus has been grown from leaves and fruit from different 

 sources on different media and under different conditions for several 

 years, but no other spore form has ever been found. Where the 

 growth of the fungus is very luxuriant, abnormal spores are pro- 

 duced, which bear four or five and rarely six appendages, sometimes 

 much longer than usual, and branched. 



This fungus is common and widely distributed, but so far as our 

 knowledge goes does not attack the fruit with sufficient frequency to 

 cause much loss. It is much more common on the foliage and may thus 

 injure the plants affected. It has been found to be present in leaves 

 which showed no external signs of disease, as has already been noted 

 in the case of Guignardia vaccinii and some of the other cranberry 

 fungi. 



There is reason to believe that where the disease is present it can 

 be controlled by the usual treatment with Bordeaux mixture. 



Helminthosporium inaequalis Shear 24 . This fungus has been 

 obtained in cultures made from diseased cranberries from New Jer- 

 sey. These cultures were made November 8, 1905, by carefully trans- 

 ferring the fungous hyphse from the pulp of affected berries to flasks 

 containing sterilized corn meal. There was nothing in the external 

 appearance of these berries to indicate that the injury was due to 

 other than the usual rot or scald fungi. The first growth of the 

 mycelium was nearly white, but very soon assumed a light, smoky 

 color, and finally became a dark, smoky brown. The whole surface 



110 



