72 
Mycologia 
sive study of the fungus, including many inoculation experi- 
ments to determine its possible host limitations. He was able to 
secure an abundant infection with the production of oospores on 
Syringa persica, Lygustrum vulgare, Jasminum nudiflorum, 
Forsythia viridissima and Crataegus oxycantha , while the twigs 
were killed on Pints communis and Primus cerasus without the 
formation of oospores. Indifferent infection was obtained on 
species of Acer, Aescuhts, Alnus, Corylus, Quercus, Tilia, Pirns, 
Mains and Primus domestica. Complete failure was recorded for 
Asalia, Betula, Carpinus, Fagus, Fraxinus, Juglans, Philadelphus, 
Plantanus, Salix, Sorbus, Erica and Calluna. While the in- 
fection of the pear would at first sight indicate a possibility of the 
identity of P. Syringae with the species reported on pomaceous 
fruits, but tbe failure to infect the apple makes the probability of 
the identity of the two entirely out of the question. 
The morphological characters of the species are included in 
the summary of the work of Himmelbaur under P. Cactorum. 
The fungus has recently been found in Holland, where it was 
carefully studied, especially from the standpoint of its economic 
importance, by Schoevers (1913), whose observations on the 
morphology of the fungus and its effect upon its host are in 
accord with the preceding papers. The statement is made that 
the conidia are unknown in nature. It is, therefore, interesting 
to note that almost thirty years earlier than any of these papers 
Berkeley (1881) described a fungus from the leaves of the lilac 
in Scotland which caused a blackening of the host similar to that 
caused by P. infestans on the foliage of the potato. The opinion 
was expressed that the two fungi were very closely related, 
although the lilac inhabiting species was christened Ovularia 
Syringae. In a subsequent paper Smith (1883) described bodies 
which he termed resting spores from decaying leaves, but his 
notes are insufficient to indicate the exact nature of the bodies 
which he found. A third note by the discoverer of the fungus 
(Wilson, 1886) describes in a somewhat fantastic manner the 
germination of the conidia by the formation of zoospores. The 
fungus appears in Saccardo under Berkeley’s name while the only 
figure cited is that which accompanied the original description. 
Apparently Saccardo saw nothing in this later sketch to indicate 
