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wenus. The fungus seemed to me to be closely related, ab least, to 

 the genus Sorosporiuin, and I sent some of Mr. Fletcher's material to 

 M, Woronine, at that time residing in Paris, and the author of the 

 valuable paper on the development of Ustilagineae which liad appeared 

 a few niontlis before. M. Woronine replied that he did not himself 

 recognize the parasite, but on showing it to Dr. INIaxime Corun, of the 

 Jardin des Plantes, be recognized it as closely related to a form growing 

 on Alisma Plantago which he had made the type of a new genus 

 Doassansia. In a letter Dr. Corun, supposing that the fungus had 

 been collected by me, stated that he had named the species Doassansia 

 Farlowii., and, as his paper in which the species Avas mentioned had 

 already gone to press, my letter stating that the fungus had been found 

 by Mr. Fletcher, and not by myself, was received when it was too late 

 to change the name. 



Dr. Corun's paper appeared in the Annalls des Sciences, G Serie, 

 Tome 15, bearing the date June, 1883, but the paper was not received 

 in this country until several weeks later. The description of our plant 

 is there given as follows : ^^ D. Farlowii sp. nov., soris ovalihus com- 

 jjressis numerosis, ovarium Potamocjetonis ciijuschim iotum occupans ; 

 sporae. Le diametre des sores oscille pour le diametre longitudinal 

 entre O™™, 2 et O""", 18; pour le diametre transversal, entre O""", 18 

 et 0™"\ 14. Tie diametre des spores, non mures, parait etre de 0""", 02." 

 Prof. DeBary, to whom M. Woronine communicated preparations of the 

 American fungus recognized it as the same as that desoibed and figured 

 in Hoffmann's Icones analytical fuugorum, p. 69, Tab. 16 f. 3 as 

 Scleroiium occultum found in the fruit of Fotamoyeton luccns and 

 P. natans. 



Before the receipt of Dr. Corun's paper, I gave a short account of. 

 the fungus in the Botanical Gazette, of August, 1883, which it may be 

 well to quote in this connection. "The fruit of the Potamogeton was 

 swollen, and a section showed globular masses scattered through the 

 substance of the fruit. The masses consisted of densely packed cells, 

 the outer layer of which was darker coloured than the rest and regularly 

 an^anged, so that the cells, which had the shajje of short cylinders with 

 rounded ends, had their longer axis always in the direction of the 

 radius. Beneath this regularly arranged layer the cells were roundish- 

 angular and presented the aj>peaiauce of parenchymatous cells." 



