STUDIES OF GLOMEEELLA FKOM DIFFERENT HOSTS. 49 



appeared. On March 10 about 25 perithecia of different sizes had 

 developed in one tube. These contained immature asci. Subcul- 

 tures made from this tube showed the same characters as the first, 

 except that numerous setae were present in the acervuli. These cul- 

 tures produced many perithecia, but no mature asci could be found. 

 This seems to be the first report of the occurrence of such a fungus on 

 this host. 



PITCAIRNIA CORALLINA LINDEN. 



Glomerella cingulata (Stonem.) S. and v. S. 



On January 29 normal, apparently healthy leaves were taken from 

 a greenhouse plant and after the usual treatment placed in a sterile 

 moist chamber. The leaves soon became covered with dark blotches, 

 and a few scattered acervuli developed. No setae were found. On 

 February 25 fertile perithecia of Glomerella- were abundant on both 

 sides of the leaf. No paraphyses were seen. The asci and spores 

 were apparently identical with those from various other hosts. An 

 ascus and ascospores are shown in Plate II, figures 25 and 25a. 



Plate and tube cultures made from conidia on the leaves in moist 

 chamber produced a growth of the usual appearance of Glomerella 

 cultures. Acervuli soon appeared. Setae were abundant in some of 

 these cultures, whereas the original tubes showed no setae. Chlamy- 

 dospores also developed and in two corn-meal flasks peritheciumlike 

 bodies occurred, but no asci were found. The conidia from the leaves 

 in moist chamber varied from 12 to 18 by 5 to 6 fi; ascospores from 

 the leaves measured 15 to 18 by 4.5 to 6 //. 



The host indexes mention no organism of this kind on this host. 



PSIDIUM GUAJAVA L. (GUAVA). 



Glomerella cingulata (Stonem.) S. and v. S. 

 Glomerella psidii (Del.) Sheldon. 



Sheldon (78, 80) has already described the life history of this form. 

 The work of the present writers covers the study of the development 

 of the fungus on leaves in moist chamber and in pure cultures. 



DEVELOPMENT ON LEAVES IN MOIST CHAMBER. 



On January 29 five apparently healthy leaves were taken from a 

 tree in the greenhouse and after the usual treatment placed in a sterile 

 moist chamber. The leaves soon showed dark blotches and finally 

 became entirely discolored. Acervuli developed first on the petiole 

 and later occurred scattered over the upper and lower surfaces of the 

 leaves. They appeared less numerous and more irregularly dis- 

 tributed than in the form produced on citrus leaves in moist chamber. 

 On April 8 a few perithecia were found on these leaves, 

 46023°— Bui. 252—13 4 



