56 PARASITES BELONGING TO THE GENUS GLOMERELLA. 



Glomerella which appeared on the leaves. The conidia from the 

 leaves ranged from 15 to 18 by 6 /* and agreed in all respects with 

 CoUetotrichum theobromicolum Delacr. ( 26) . Two or three other species 

 of CoUetotrichum have been described from this host. The conidial 

 measurements given are smaller than those of our organism, and they 

 may perhaps belong to different species. Bancroft (5) has discussed 

 the species on this host. 



VANILLA PLANIFOLIA ANDREWS (VANILLA). 

 Gloeosporium rufomaculans (Berk.) Thum. 



On January 26 plates were poured, using conidia from acervuli on 

 leaves of vanilla received from Miami, Fla. Setae were present in 

 some of the acervuli and wanting in others. Acervuli soon developed 

 in the poured plates, and four subcultures were made in tubes. 

 Acervuli soon developed in the tubes, but their number, size, and 

 distribution varied greatly. In one tube there was only one large 

 acervulus, in another the surface of the medium was -thickly dotted 

 with acervuli with pinkish spore masses. In some of the tubes the 

 mycelium remained whitish, in others it became quite dark col- 

 ored. The variations in amount and color of the mycelium, and in 

 the number, size, and distribution of the acervuli were very striking. 

 No perithecia or peritheciumlike bodies were found in any of these 

 cultures. The conidia from the leaves ranged from 13.5 to 24 by 

 4.5 to 6 ft. 



There are no sufficient morphological characters to distinguish this 

 fungus from that found on the grape and apple. It has therefore 

 been referred to the same species. Physalospora vanillae A. Zimm. 

 (97) is apparently the perithecial form. 



VITIS LABRUSCA L. (CONCORD GRAPE). 



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

 Gloeosporium rufomaculans (Berk.) Thum. 



On July 30 plates were poured from acervuli of Gloeosporium found 

 on rotten grapes at Washington, D. C. These produced the usual 

 whitish mycelium and numerous acervuli, and a little later perithecia 

 of Glomerella with mature asci and spores were found. Transfers of 

 perithecia from these plates to tubes produced large acervuli and a 

 considerable growth of the dark bluish hyphse which frequently char- 

 acterize old cultures. Mature asci and perithecia were found in one 

 of these tubes. In two others perithecia were present but no asci 

 were seen. 



On September 25 four plates were poured, using conidia from a 

 single acervulus in the tube just described, which contained the fertile 

 perithecia. Transfers were made from these plates to four other 



252 



