144 ILLINOIS ACADEMY OF SCIENCE 



to the same species as that causing bitter rot of the apple, G. 

 rufoniaculans, var. cyclaminis, though, perhaps, like many of 

 the fungi nominally connected with that of the bitter rot 

 doubtfully belonging to it, and with this the conidial Colleto- 

 trichum form. One other spot disease rather indefinitely de- 

 scribed has been reported by Professor Halsted under the name 

 Phoma cyclamenae* 



In the plant houses of the University of Illinois in the 

 winter of 1913-1914, there appeared in rather small quantity, 

 a wilting of the older outer leaves of cyclamens at the flower- 

 ing time, which, without any marked discoloration of the 

 leaf, is attended by a frosty mildew on the under surface near 

 the soil. There was also observed by Dr. J. T. Barrett in 

 the autumn of 1907, a considerable epidemic of a leaf spot 

 on cyclamen, this disease being marked by deep brown discol- 

 oration of the large affected areas on the upper surface of 

 which small pustules occurred with extruding tendrils of 

 colorless spores. 



The disease of 1913-14 is found to be due to a mycelium 

 that appears to be localized within the wilting parts of the 

 leaf and that fruits by sending out tufted colorless conidio- 

 phores on the lower surface, the stomata through which these 

 tufts protrude on the diseased area being rather conspicu- 

 ously brown or red in contrast with the general whitish green 

 of the lower leaf surface. From the ends of the conidiophores 

 simple chains of colorless conidia reaching a length of one 

 hundred microns or more are cut off, these chains being 

 slightly moniliform by the constriction between the spores 

 which remain attached together for a long time but are easily 

 and completely disassociated in the preparation of material for 

 examination. 



No- doubt can exist that this fungus corresponds to the 

 conidial stage of many ascomycetes the mature form of which 

 is usually found on dead leaves later, and although it violates 

 the fundamental division of the hyaline spored Mucedineae 

 between two-celled and many-celled forms, it is hardly to be 

 referred elsewhere than to the form-genus Ramularia, many 

 other species of which fail to show more than a single septum 

 in the conidia. Thus far, no hyphomycetous fungus has been 



•The type material of this, as I learn from Professor Halsted, has been lost. 



