THE 
JuLy 10, 1875.] 
GARDENERS 
CHRONICLE. 
35 
SUT TORS 
CHOICE STRAINS 
FLORISTS’ FLOWERS, 
(POST FREE. 
The Finest Strain of Calceolaria. 
SUTTONS’ SUPERB CALCEOLARIA, 
This ne кана has been most carefully ges from 
the very fi cultivation. 'The plants 
pact in habit, with beautiful green foliage and a ома х 
bloom. The flowers are large, perfect in form and substanc 
and of every shade of brilliant colour.—-Price 2s. 64. ir 
packet, post free 
From А. Е. RussELL, Esg., Dalnabreck, N.B., Yuly то. 
alceolaria plants from your seed of last year are par- 
ticularly fine, of very compact habit, and very fine in colour.” 
The Finest Strain of Primula. 
SUTTONS' SUPERB PRIMULA. 
splendid strain, which has been carefully selected from the 
жд fringed flowers of good colour. Habit robust, with 
bloom thrown well above the foliage. Red, white, or mixed, 
25. 6d. per packet, post fre 
From WALTER EpwAnps, Esq,, Wellington, Somerset, 
Fan, 21, 1875. 
“А more beautiful strain of Primulas than I have had this 
winter, from the seed you supplied me with last spring, I never 
saw,” 
The Finest Strain of Cineraria. 
SUTTONS’ SUPERB CINERARIA. 
This ia be deb Pata а ass in cultivation, the seed 
having b st named varieties only. Price 
25. 6d. per packet, post free, 
From Mr. А. ALLERTON, Coleman's Prittlewell, May 8, 1875. 
seed, are splendid ; far 
rday. 
“ Our Cinerarias this year, from your 
surpass any I saw at the Botanic Gardens yeste 
The Finest Strain of Cyclamen. 
SUTTONS’ PRIZE CYCLAMEN. 
The following varieties have been carefully selected к опе 
of the finest strains in cultivation, and, as th 
from November till сиеси и" ssi ones for decorating the 
Conservatory or the winter months. The 
flowers also are extremely valuable for bouquets as omi retain 
their freshness for a considerable period when kept in 
drawinco-r. 
LBUM, pur ROSEUM ALBUM, white 
MAROINATUM i rose,edged | and red 
with w RUBRUM. bright crimson, 
ROSEUM.; rose and carmine. PURPUREUM, purple. 
Price 55. the Collection, post free. 
From W. Н. seers ee àv ae Lodge, 
“The aa I did from мт pom autumn have given me | 
great satisfaction. 
бине 
THE ,QUEEN'S SEEDSMEN, READING. 
а JULY: 10, 1875. 
THE d SPORES oF THE 
0 DISEASE, 
oe Potato disease d in this country is rarely 
seen before the month of July, but this 
year I received some infected leaves for exa- 
mination from the Editors of the Journal of 
Кошу: at the beginning of June, and 
my reply to the correspondent was printed on 
june ro. eaves were badly diseased, and 
I detected the Peronospora in very small quan- 
tities here and there, emerging from the breath- 
ing pores. This was a week or ten days before 
Mr. Berkeley brought the matter before the 
Scientific Committee of the Royal Horticultural 
pes aen 
dust) I immediately accused myself of 
great carelessness in possibly overlooking it ; 
but I was equally certain of the presence of the 
pe R in the specimens I examin 
receiving authentic specimens of diseased 
м» from Mr. Barron of Chiswick, the brown 
spots on the Potato leaves at once reminded me 
of the figures of some species of Protomyces, 
and the dimensions agreed tolerably well with 
some described plants of that genus, but the 
sparingly mixed with other bodies much smaller 
in diameter, and with a greater external resem- 
blance to true fungus spores. These latter 
spore-like bodies were of two sizes—one trans- 
parent and of exactly the same size as the cells 
of the leaf (and therefore very easily overlooked), 
and the other dark, reticulated, and much 
smaller. A few mycelial threads might be seen 
winding amongst the cellular tissue, and these 
e to the conclusion that the 
other leaves are thickened, blistered, and dis- 
colored by the spawn of the Ascomyces, as illus- 
trated at tHe last meeting of the Society. 
pinion, tege was soon formed that 
the “new” Potato disease (as it has been 
called) was no =з than the old enemy in 
er r words, that it was the old 
the = of this ere forward and out of 
season was probable; but the idea that the 
pest would not at length attack all and every 
sort of Potato was to me most unreasonable, 
though the more tender sorts might be the first 
to suffer. 
Suspecting the two-sized small bodies EA 
mentioned to be of the nature of spores, a 
remembering my experiments during . 
autumn wide ketchup, in which I observed a 
the spores of the common Mushroom might be 
boiled several times, and for lengthened periods, 
without their collapsing or bursting, I thought 
set free the presumed spores of 
ыз spores fro: 
not treat the apo with bing vat a ater, ^ use 
1 wished to keep the threads and spores alive. 
From day to day I kept the diseased ма 
and stems and tubers wet between pieces of 
very wet calico, in plates under glass, and I 
immediately noticed that the continued moisture 
greatly excited the growth of the mycelial 
threads ; this to me was quite unexpected, as I 
had: у wished to set the spore-like bodies 
free. pid was now the growth of this 
cdm that after a pak had elapsed some 
decayed parts of the lamina of the leaf were 
сей in every direction by pr aas 
Thinking the close observation of t 
li 
produced a tolerably abundant crop, especially 
in the abortive tubers of the two-sized bodies I 
had previously seen, and measured in th 
The 
is, I imagine, because they require a different 
set of conditions for their normal growth, and 
these Missa are found in abundant and 
continued moistu 
The larger of mnt bodies, the measurements 
of which I shall give, with a woodcut illus 
tion, in an early number of this journal, I am 
disposed to consider the “oospore” of the 
Potato fungus, and the smaller bodies I look upon 
as the *antheridia " of the same fungus, which 
are often terminal in position. The filaments of 
umbelliferum, and this is another reason (be- 
yond my seeing undoubted infestans on 
Potato leaves at the beginning of June) why I 
am disposed to look upon these bodies as the 
oospore and antheridium of the Potato fungus. 
The larger bodies are at first transparent, 
thin, pale brown, furnished with a thick dark 
outer wall, and filled with granules ; at length a 
number (usually three) of TEC or m 
appear. The smaller bodies ker 
colour, and the external coat is es vitia a 
(described as belonging to the antheridium of 
other species of Peronospora), but I have. 
Sead the two bodies in contact in several in- 
stances, After fertilisation has taken place, the- 
outer coat of the oospore enlarges, and appears ` 
to be cast off. Both antheridium and resting 
spore are so slightly articulated to the threads 
on which they are borne that they are detached 
by the slightest touch, but with a little care it is 
not really difficult to see both bodies 27 siu; 
and my observations lead me to think that con- 
jugation frequently takes place after both organs 
he antheridia me oospores 
decomposed portions of the tissue of em decom- 
posing tuber, but they occur also in both the 
stem and leaf. I consider Mr. Alexander Dean's 
remark, as reported in Gardeners’ Chronicle for 
ct bearing 
| June 19 perdus 795 to have a distinct 
he 
on this point says :—" In all cases 
eee the secd ‘abies were cut m were dnd 
pagine Pt 
m 
bodies thr in the Potato = to 
Saprolegnia, but glance at the figures 
which I shall shortly publish and the similar 
figures copied from De Bary to to the same - 
scale, will show that if the bodies | 
olegnia-like, о 
