LESS IMPORTANT DISEASES. 41 



Spot'onemn oxyroccl Sliear.-^ — This oxcii)iilac(M)us fiinjjus lias been 

 fouiul on ('ranl)errv loavos from various localities. Tho pycnidia are 

 inipertVctiy developed, (he upper portion bein<j^ thin and disappearing 

 toward the center of the disk (PI. V, fig. 18). They are dark brown, 

 scattered or gregarious, pulvinate, covered by (he epidermis, and 

 measure about 50 to 100 /i in diameter. They rup(ure by a longi- 

 tudinal ()!• irregularly (riangular sli( (PI. V, tig. IT). The spores 

 are continuous, hyaline, cylindrical, ob(use, borne on very short ovoid 

 sporophores, and measure 17 to 19 by 3 to 4 /x (PI. V, figs. 19 and 20). 

 In cultures the range of variation in spore measur(>men( was some- 

 Avhat greater, being 15 to '20 by H (o 4 /i. 



Specimens have been ()b(ained from Carver and on Cape Cod, 

 Mass., and Mar(insville. Me.; also from near I^elleplain and Wliites- 

 ville, N. J., the dates ranging from June to September. 



This funjrus has usuallv been found on dead or dving cranberry 

 leaves, but in one instance it was found in a diseased berry which was 

 obtained in (he "\Vashing(()n market. The berry had a soft, slightly 

 discolored spot. After thoroughly washing and soaking (he berry 

 in corrosive sublimate soludon. a poiHion of (he diseased pulp and 

 skin of the fruit was carefully (ransferred to a Hask of sterilized 

 corn meal. Normal i^ycnidia of (he fungus developed upon the 

 portion of the skin of the berry in the culture. The mycelium 

 spread to the culture medium and formed a rather compact (hin 

 layer, at first whitish, then dark grayish green, antl finally dark 

 grayish brown and somewhat mouse colored. In about a month 

 mature pycnidia were formed about the sides of the flask. The so- 

 called pycnidia are incomplete and consist in the culture of dense, 

 dark, pulvinate masses depressed at the center where the pycnospores 

 are borne and somewhat overgrown by loose hyphw from about the 

 margin. Frequently instead of normal spore development (he sporo- 

 phores became lengthened and formed irregular stout hyaline fila- 

 ments about (Avice the length of the spore. The single instance in 

 which this fungus has been found in the fruit shows that while it is 

 capable of injuring the fruit, it perhaps does very little damage at 

 present. 



Arachniotus trachyspermus Shear.-^ — This fungus was first iso- 

 lated from a very badly diseased berry from New Jersey which had 

 been kept from September until April 11. The berry was very soft 

 and light colored. The same fungus has also occurred twice on the 

 surface of decayed fruit which had been kept in a moist chamber for 

 a considerable period. 



In pure cultures the fungus first forms a fine, thin, white mycelium, 

 which is soon followed by the development of minute arachnoid 

 snowy-white perithecia ''PL IV, figs. 18 and 19), which are 325 to 



110 



