Wilson : North American Peronosporales 
75 
Further studies of the species were made by Coleman (1910), 
who found that in water cultures the conidiophores often bore as 
many as twenty conidia. Chlamydospores were produced in his 
cultures in abundance, but oospores were absent. Extensive in- 
fection experiments were carried on in connection with those on 
P. Arecae, under which species they are detailed. In addition the 
cacao fungus was inoculated onto Areca nuts, obtaining a slight 
infection in one instance. He named the fungus P. Theobromae 
giving as its hosts, on the authority of Petch, Theobroma Cacao, 
Hevea brasiliensis and Artocarpus incisa. In a postscript to his 
article he notes that “ since the above was written an article by 
Petch . . . has brought to my attention the fact that the cacao 
fungus has been already given the name of Phytophthora Faberi.” 
In listing the species of the genus Pethybridge includes P. Faberi 
which is “possibly synonymous with P. Theobromae.” 
From the fact that this fungus is more destructive in the Amer- 
ican tropics than elsewhere it is not impossible that this is its 
home. This is further borne out by the fact that in the West 
Indies it attacks a second species of Theobroma, while its two 
chief hosts are American in origin. Indeed the bread-fruit is the 
only well authenticated host of oriental origin, and on this its 
occurrence appears to be quite limited. 
13. Phytophthora omnivora De Bary 
All members of the genus Phytophthora which were not refer- 
able to P. infestans were collected together under this name by 
De Bary. So constituted the species included all those forms 
of the genus found on seedlings and succulents in Europe. Re- 
cent work has shown some of these forms to be morphologically 
distinct, so that it is now a question as to just how much, if any, 
of the original mass of material can remain under this name. 
Since the time of De Bary various writers have added their mite 
to increase the confusion until to-day the species as usually recog- 
nized is indeed a “ waste basket ” into which is thrown any 
unidentified Phytophthora. Some of these have recently been 
removed and given their proper status as species, while others 
which have been adequately studied by their discoverers have 
