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J0TJENAL OP THE EOYAL HOETICUITUEAL SOCIETY. 
Dr. Cornu afterwards proceeds to the description of another 
Cladosporium found by him on leaves of Vincetoxicum , and con¬ 
cludes thus :—“ These species deserve to he studied carefully, as 
it would be interesting to know the form and nature of their other 
modes of reproduction. The genus Cladosporium includes plants 
varying much from each other, and which all belong to the 
Ascomycetes.” 
Assuming that this second form of disease has been accurately 
determined as identical with the specimens published by Rabenhorst 
in his “Exsiccati” (1854, IN'o. 1877), there are some points of interest 
as to the distribution as well as the synonymy of this mould. It 
certainly has the merit of bearing many names. Thus it is the 
Cladosporium, viticolum of Cesati. It is also the Cladosporium 
ampelinum of Passerini, by which name it is known in Thuemen’s 
“Pilze des Weinstockes.” Under the name of Ceroospora vitis, 
Saccardo distributed specimens in his “MycothecaYeneta” (Nos. 284, 
363). Pirotta has also published a memoir of the species in Italy 
under the name of Helminthosporium vitis, Pir. Before all, 
specimens were distributed many years since from the United 
States by Dr. Curtis, under the manuscript name of Graphium 
clavisporum, Berk, and Curt., and under this name it was described 
by the Rev. M. I. Berkeley, in “ Grevillea ” (vol. iii., p. 100). This 
mould has therefore been referred to four different genera, and has 
had at least five names. This is not the place or time to discuss 
which is the genus for which it has the strongest affinity, but it 
certainly appears to me most closely related to Helminthosporium, 
the bundles of hyphse being densely crowded, but not united as in 
Graphium, and in fact closely resembling Helminthosporium Petersii , 
Berk, and Curt., on leaves of Smilax. It is a gather aberrant form 
of Helminthosporium . (See also “ Grevillea,” vol. vi., p. 149.) 
As to the distribution of this mould, it is curious that this also 
should be known in the United States, as well as in Italy, Prance, 
and Austria. It only proves how important it is that we should 
acquaint ourselves with the parasitic fungi of the United States so 
many of which appear to be common to the New and Old World. 
Here are two presumed instances of the occurrence of North 
American Yine fungi in Europe. Who shall say that we may not 
even yet have the Peronospora ? 
In conclusion I may be permitted to record a protest against 
the last words of Mons. Cornu’s communication. Because one or 
two species of Cladosporium are believed, on rather strong evidence, 
