130 FL 
GARDENERS “CHRONICLE: 
[JULY 31, 1875, 
able, though subaromatic scent.” Many varie- 
ties of this species are in cultivation in English 
gardens 
The Oak-leaved Geranium (P. ae) 
is also an old garden favourite, introduced fro 
Harvey describes them as “ sinuato-pinnatifid.” 
They are but shortly stalked, thus giving the 
plant a more solid and bushy appearance ; the 
flowers, too, though similar, are larger. The 
scent is 9: PTE ска according 
to Dr. Harvey, but pleasant to ot 
A near ally of this species is Р. е, 
і to Kew Ga by 
Museum herbarium. This is a large plant, the 
leaves of which are more hastate in outline than 
those of P. quercifolium, but otherwise resemble 
them, and are very viscid or clammy to the 
are larger and more 
This is another species which is 
naturalised in Madeira, where it is very exten- 
sively used as a hedge plant. The scent, which 
Dr. Harvey characterises as heavy and bal- 
samic, is, according to Mr. Lowe, *strong, but to 
tomen 
plant with soft, velvety lobed leaves and ve 
small white flowers, is another species which 
has been in cultivation on account of its scent, 
which somewhat resembles that of Peppermint : 
it was introduced in 
P. capita atum—sometimes called the “ Rose 
Geranium "—is another scented species which 
is of some economic importance. We ar 
indebted for it, as also for P. cucullatum, to the 
Earl of Portland, by whom it was introduced i in 
1690. It has lobed cordate long-stalked leaves, 
and densely crowded heads of numerous deep 
rose-coloured flowers ; the whole plant is soft, 
with long white hairs. This species is exten- 
prey cultivated in Provence and other piis "d 
ce rance, an essential oil which i 
tected from its leaves being tail e чс d 
in perfumery, and for adulterating the essential 
oil of Roses. 
this species, to which he 
seems to refer todo the name of P. odoratis- 
simum. 2 e 
y the Rose growers, 
the adu taai of $ RETI Оше at Montfort: Далан 
: | of it may be se E 
of essential ar sed to bri qa otto of — it is 
in its Massen oe with Ginger- oil (Andr 
pogon), and thus formerly was v 
enuine ; on account of the increased ealtvaton ne 
blat, it is now, however, easi! 
samples are мага others nearly y white, but 
we prefer that h tint, 
rectified ч in the proportion of about. pcg pas 9 
the к: forms the extract of Rose-leaf Geranium of 
the y word or two i the oil of 
ordena ch c ed ng it, 
in consequen ere oil under the of 
Geranium, but which in reality is derived from one of the 
Andropogons cultivated i e Molucc The sa 
Andropogon (Geranium !) oil can be used to adulterate 
the true Geranium, and hence we suppose its nomencla- 
in tb Th enuine Rose-leaf 
to England, a, the Ве "et 
"ee toe Sues s cse from 
© more kable and 
Fave been, but are as at present in 
=p stati p 97, col. ¢, line 14 from top, ‚ fr “zonale” : 
peur 
attention to of the 
Чым» species which | 
m Сиш 
New Garden Plants. 
SACCOLABIUM eM: п. sp.* 
This is qu uite a botanic c sity. The leaves are 
7 ndis e by 3 inch w ide, ve оф ie pre rather 
of strong texture. The inflorescen ric 
whitish бту small flowers cake oe think of 
the rich me of some Erias. I have no knowledge 
whence it c ap It ra nis near Saccolabium pins 
Lindl., bab | t has much narrower, smaller leaves, 
and distant pee I obtained it from Mr. Bull, 
Н, С. Кей. f. 
MUSCARI MOSCHATUM VAR, CRETICUM, Baker.t 
I take this to be a curious eroi of the well-known 
Muscari теу but added to its botanical 
which reduce themselves to 
flowers 
It was in full flower on June 20, on whic 
he bulbs Унан — red by Mr. 
Elwes in ста - the bir sor rue nes ч а height 
of some 7000 above sea leve i owered 
by him at Cirencester this nete year, an i 
men pre the Kew collec 
shape and rico ult like those of М mo: 
three in number, sub-erect, 3—4 inches long. 
2inches long. Ri i 
1ġ—2 inches long. 
mere purple tip, eee > ы long, supported on 
patulous pedicels nearly as long as themselves, Bracts 
just like those of common piget үбүн тией flowers 
smaller and entirely purple. $. С. 8 
THE RESTING SPORES OF THE 
= POTATO DISEASE, 
(Concluded from p. тот.) 
As I have now had the fungus which causes the 
Potato disease under close observation for the past 
seven weeks, I send you some of the most noteworthy 
facts which have more recently attracted my 
attention. 
I. The plants sent to the Royal Horticultural 
Society by Mr. Dean on July 21 were covered with 
the Peronospora far beyond anything I had ever seen 
before. The haulm, the leaves (on both sides alike), 
and the berries, were covered. Some of these plants, 
after being placed on a garden bed, and covered with 
leaves (to keep them moist), were the next day one 
white mass with the Peronospora. 
2. The Potato fungus (as commonly seen) bears a 
far larger number of simple spores than inflated 
vesicles containing the zoospores or swarm-spores, = 
in Mr, Dean’s plants the fungus produced zoospor 
almost exclusively, and in the greatest abundance. za 
the zoospore is a higher development of the plant 
than the simple-spore, this latter observation points to 
the unusually robust health of the fi this season, 
3. On suspending the infected leaves over a glass of 
water for from twelve to seventy-two hours, the swarm- 
spores fell in abundance (either free or in the vesicle) on 
to the water, and there germinated. Nosingle drop of 
the water could be taken up for examination without 
meeting with the мең spores, the threads 
radia’ iating : over the water in every direction, evidently 
It brought the follow- 
ing fact to light, which i is of imp the 
this cord, when it had proceeded 
tance over the water, there had its contents differen- 
tiated in a necklace-like manner, and Ee birth to 
the zoospores far removed from the original vesicles. 
The mim thread also produced two true oogonia on 
the wa 
4. cs your last report of the re. ofthe Scientific 
Committee (p. 113, middle column), under Sapro- 
ia, you say Mr. Renny showed a species of Sapro- 
legnia which might be mistaken for the spores (mean- 
ing oogonia) of Peronospora. But if reference is made 
to my original paper it will be seen from the first that 
I have perceived the intimate connection between the 
— 
Saccolabium dives, Rchb. f., n. sp.— Foliis lineari-ligul 
а She baa oblique retuse que bi >; racemis densissimi 
ovaria pedicellata мей, at i tepalisque qu te 
i ; labelli 1 ibus сигез а, 
media [triangulo-lineari introrsum uncata ; calcari cylin- 
apice subito attenuato; columna antrorsum gibba, 
draceo, 
H, * G. Rc » 
aun dpi t saque че, var. Bert cee Baker.—Inodorum, 
suberectis 3—4 poll. 
papo bpollicari, racemo күзөтчү, rcge € 
т, poll iongo ; 
y decom 
um ; and | horrible fat and turns mes inside ; 
a considerable dis- · th 
new condition of the Potato fungus and the Sapro. 
legniee. On my side I have the high ine 
Thuret and Berkeley for similar altern in the 
as the Peronospora, is fo The same 
iia in the Saprolegnieze will alternately produce, 
under the same (or different) conditions, zoospores or 
— ade се if zoospores are pr 
nny's te 
Mr. R oogonia i 
atis that er different conditions resting-spores 
would be formed by simila cells. ‚ from the 
, а that state it quite 
d n diverse plants and substan 
sata s places, as you well explained the subject 
k. The Saprolegnia is the caterpillar 
condition — to the water, like the larva of 
the dragon-fly), the Peronospora somewhat analogous 
with the perfect butterfly, and the resting-spore with 
the chrysalis. 
5. I find by experiment, when badly diseased haulm 
i b 
ast 
commonly frees itself and floats on the surface of the 
water, and must be carefully taken off A iti sit 
oogonia now 
is with a camel-hair pencil. 
produce zoospores es in the water, as in Pythium, which 
is possible and even probable, it in no way in 
my views, or makes the connection less probable 
T E a true "US and the Peronospora. 
aérial spo f the* Peronospora never 
become nece in pe whilst the oogonia and 
antheridia are always so. 
7. A superabundance of water excites the growth 
of the mycelium, but it retards the proper production 
of the resting.spore, just as a superabundance of 
bereit in most plants ies leaves and retards 
flow 
8. ya my calendar of the weather I find we had 
here only E wet ge from May 7 to June 10 dis 
dry wea 
its usual shape, and ca: e. 
ave got my per abundant materials from 
stroyed, m: what is most ~ there is no 
ell. tuber poses... 
s qt the starch is 
resent and not much injured, and very little 
been res 1, it certain] 
that means may be found to mitigate the damage done 
every year by the Potato murrain, Worthington 
G. Smith. 
eee a a eo UM TES 
HALF HOURS AT ERN ЫБ 
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