152 
MR. BEKKELEY ON MILDEW OF HOLLYHOCKS. 
Chilena*' are: — Hypophyllous ; son scattered, hemispherical, 
at first covered by the cuticle which remains attached in the centre, 
umbilicate beneath, the border rufous ; spores densely crowded, 
ovoideo-oblong, even, brown, somewhat constricted, in the middle 
obtusely acuminate, with very long hyaline pedicels." (See fig, 
p. 150.) P. ahutilij on the contrary, has very short, obtuse pseudos- 
pores, scarcely constricted in the middle, and very short pedicels. 
It is now some years since I received from Lieut.-Colonel Grant, 
of Wellington, Neilgherries, some leaves of Orange and Mango 
which were infested with the oidioid form of some Erysiphe. It 
was stated that neither hot and dry nor wet weather appeared to 
affect it, and that it was very destructive. This, indeed, was plain, 
from the appearance of the leaves, as the parenchym was com- 
pletely exhausted where the parasite was attached, and had become 
brown. Our attention has lately been recalled to the subject by a 
sprig of Orange from Mooloya, Hewahette, Ceylon (4000 feet), 
sent by Dr. Thwaites, under No. 1230, too late to be included in 
the account of Ceylon Fungi lately published in the journals of the 
Linnean Society. The Wellington specimens exhibit, except in one 
minute spot, nothing more than a form of Oidium with rather long, 
almost truncated joints. In the Ceylon specimen there is a trace 
of these, though most have been absorbed, and in their place a 
multitude of both conidio-morphic and spherical pycnidia, pouring 
out a profusion of stylospores, exactly as in the figure which 
Tulasne gives in his Carpologia i., t. 5, fig. 3. It is most probable, 
therefore, that the species is one of the forms of Erysiphe communUy 
and it is the more interesting because the genus is not hitherto re- 
corded as occurring in the Eastern Indies or the neighbouring 
islands. The perfect fruit has not yet been found. As the Yine 
mildew has extended to tropical climates, and is capable of being 
propagated on other plants, it becomes a matter of interest to 
inquire whether the parasite in question is not identical, and 
whether it has not been introduced with it. It is not confined to 
either surface of the leaf. The question of its possible introduc- 
tion is the more important in consequence of the sudden irruption 
into Australia, and more recently into Europe, of Puccinia malva- 
cearum ; and it is well that the matter should be recorded, as it may 
throw light on future observations, should the pest spread either 
on Orange trees or Mango. 
As it appears to be quite superficial, there can be no doubt that 
it would be checked by sulphur. We have not heard of its occur- 
