LE 
JULY 17, 1875.] 
GARDENERS 
CHRONICLE., 
69 
In attempting to wash-the circular bodies out of 
the leaves and stems, by maceration in water, I found 
the moisture greatly accelerated the growth of the 
mycelium, and that the long-sought-for oogonium and 
These bodies 
Afterwards I found them more 
abundantly in diflerent stages of maturity, especially 
in the very putrid stems and in the tubers when in the 
last stage of decomposition, Mr. Berkeley afterwards 
—PERONOSPORA ALSINEARUM. 
Osa; ii Antheridia enlarged 400 diameters. 
Fic. 11.—THE ARTOTROGUS OF MONTAGNE AND BERKELEY; 
™ enlarged 400 diameters. 
W.G.S: AD,NAT.DEL. 
In the accompanying illustration, which is an 
exact copy of the first sketch taken, the oogonia and 
antheridia are seen in the Substance of the lamina of 
maceration in 
| water. The semi-mature resting-spores, as shown in 
12,—PERQNOSPORA UMBELLIFERARUM. 
d and Antherida, enlarged 400 diam 
G. 13.—PERONOSPORA INFESTANS. 
FIG 
Oogoni е rag fi - di а 1 of Potato, after а week's maceration in water ; 
Men cited Fus 2 ch бойон n nium M M. oor inch. Coat of Cellulose 735 = pru. 
ium журе = 
м them with abundant mycelium, 4.4, after last 
tural | — 
Mr. Broome ' (from 
has zc detected and аана 
erial me) 
together with the immature corsage bodies, one of 
these brown , but it was 
of 
me to say he has never seen 
eL 
a A diameters, 
gly warted, а 
in outward aspect, йет! of one spore, a dense соп- 
ies. The 
creted mass of minute brown-black 
antheridia are shown at NN. bes resting- 
spores are slightly — and on an average are 
one-thousandth of an in diameter. They are 
not here engraved, rrence, 
о" 
E as, Tet tie occu 
it is only during the last few ^ ачин ae 
T and the time has been insufficient for v e 
oosphere is fertilised by the contact of the an- 
dia when the two bodies accidentally ond 
the latter. fixes a small branch 
soon vanish, and the spores are free. 
hen I read my notes last week before the Royal 
Horticultural Society I had not been able, as I then 
said, to detect this fecundating tube, but since then I 
arried by the air into the 
breathing pores, and the whole history of the fungus 
here described is re-enacted. 
Since my observations on these bodies were pub- 
lished in the last number of the inlet Chronicle, 
I have (by the courtesy of the Rev. M. J. Berkeley) 
Montagne’s in 
ed respect, and when reflected and traced with the 
of a camera-lucida no чирү whatever can be 
detected The bodies seen in Dr. Montagne’s speci- 
without doubt, en fertilised and half-mature 
vadit aad: and therefore dense, uncollapsed, and 
exactly the same in size, habit, and 
d of 
B 
E. 
е expected, have 
, but it is io difficult to find 
traces of antheridia in the 8 specim 
For comparison, the original pikes of Artotrogus 
(fig. 11) is here exactly reproduced to the same scale 
as my drawings, from vol. i. of the Journal of the 
Royal Horticultural Society, to show the similar nature 
of the bodies illustrated. Since this was engraved 
Mr. Berkeley has kindly forwarded Dr. Montagne’s 
original drawings to me for examination, and I may 
les 
Dr. Montagne, I hinder this of little 
moment, as the oogonia are at times almost or quite 
sessile, and consequently, when seen in some positions, 
е appearance of being within the 
mycelium, whilst in reality they are upon or under it. 
As for body at o, described as a 
** mature spore," it is not oe like Dr. , Montagne's : 
original drawing, which is with a 
thick wall, and there are no “ mature” spores in his 
specimens, After a most careful and searching exami- 
nation Lis latter I can find no such bodies, but there 
correct. the actual 
and measured side by side they are in every way 
identical. 
Mr. Berkeley has also most obligingly sent me a 
specimen of another (new species?) of Artotrogus, 
found in decayed ‘Turnip by Mr. Broome in 1849. 
Here th: he threads and semi-mature pase in Ше 
эу 
Ши шше pe л шу siae RR 
