1900 SUPPLEMENT—RECENT INTRODUCTIONS, &C. 7 
Acer—coniinued. 
A. platanoides compactum (compact). An ornamental variety, 
producing a compact, round head. 6. 
A. p. lobosa (globular), A neat, round-headed form, rather 
slow in growth. 
. inte ohum (entire lobed), This only differs from the type 
Sey lobes uf the leaf ex (R. @ 1887, p. 431, f. 107-8 ) 
A. p. multicolor (many-coloured). 7. red, large, speckled and 
blotched with yellowish-white later. 1896. 
A. p. Reitenbachii (Reitenbach’s). J. large, changing in the 
autumn to a deep crimson-red, varying to yellow and brown. 
A. p. rubrum (red). A variety with leaves distinctly reddish- 
brown. 
A. p. undulatum (wavy). 7. bullate, with very wavy, crisped 
margins. A curious and interesting variety. 
Among other varieties of the Norway Maple the following may 
be mentioned: columnare, dilaceratum, euchlorum, integrijolium, 
nanum (SYN. pygmeum of gardens), and quadricolor. 
A. polymorphum (many-formed). A synonym of A. palmatum, 
Fic. 6. ACER PALMATUM LINEARILOBUM. 
A. Pseudo-platanus atropurpureum (dark purple).* A 
very fine variety, with dark purple leaves; worthy of extensive 
cultivation. 
A. P.-p. elegantissimum variegatum (very elegant, varie- 
Are i. in spring suffused with rose-pink on a cream ground, 
and in some cases irregularly splashed with green. A vigorous 
and showy sport from A. P.-p. Leopoldi. 
A. P.-p. flavo-marginatum (yellow-margined). /. pale green, 
mottled and edged with white. 
A. P.-p. Leopoldi (Leopold's). 7. marbled with purple, yellow, 
and green; petioles red. A very pretty, Belgian variety. 
A. P.-p. Webbianum (Webb's). Similar in colour of leaves to 
Jlavo-marginatum, but of more vigorous growth. 
A. pulchrum (pretty). A synonym of A. diabolicum. 
A. pygmezeum (dwarf). <A garden name for a dwarf form of 
A, platanoides integrilobum. 
A. rubrum Drummondi (Drummond's). J. streaked with red 
_on the upper surface, glaucous beneath. 1892. (R. G. 1374.) 
A. septemlobum (seven-lobed). A form of A. palmatuin. 
A. Trautvetteri (Trautvetter’s). A synonym of A. Van Volxemi. 
A. Van Volxemi erythrocarpum (red-fruited). A variety 
with red fruit. Caucasus, 1892. 
A. velutinum (velvety). A synonym of A. insigne. 
A. Wieri laciniatum (Wier’s, cut). A weeping variety, having 
long, slender shoots clothed with delicately-cut foliage; it is 
admirably adapted for the outskirts of the lawn. 
InsEects AND DisEAsEs. Several of the commoner species 
of Maples used for the decoration of large gardens and 
parks are frequently almost defoliated early in the season. 
This is especially the case with the Norway Maple 
(A. platanoides), the Common Maple and its varieties, and 
less frequently, perhaps, with the Sycamore. Such defolia- 
tion usually takes place between August and September, 
and is yery noticeable some years in our London parks. 
Acer—continued. 
It is due to a distinct and well-characterised fungus, 
Rhytisma acerinum. Popularly it is sometimes called 
Maple Blotch, on account of the roundish yellow patches 
found upon the foliage in late summer. These towards 
autumn take on a black colour, and the leaves are shed. 
In such cases spraying is out of the question, and pre- 
ventive measures must alone be relied upon for lessening 
the attack another season. This is best done by collecting 
and burning the leaves, which otherwise would be the 
means of conveying the disease to the trees in the spring. 
Another fungus frequently found upon Maples (Acer), as 
well as upon other trees used ornamentally in parks and 
large gardens, is Nectria cinnabarina, a near relative of 
that pest of Apple Orchards mainly responsible for the 
condition known as Canker. These are popularly known 
as Wound Fungi; on account of their only attacking 
a tree which has previously been injured either by at- 
mospheric influences, or by careless use of tools at planting 
time, &c. N. cinnabarina is quite unable to attack a 
tree with absolutely sound bark; but once a wound has 
been made the fungus finds an entrance, and the wood is 
immediately involved, as the mycelium spreads rapidly, 
working in an upward direction. Naturally, the sap-flow 
is considerably interfered with, and that portion of the 
tree is unable to receive any nourishment, the wood 
assumes a blackened appearance, and the invaded branches 
die away. To an unpractised eye the causes may not at 
first be evident, though later they should be, when the 
very beautiful orange-red stromata are produced upon the 
bark in the vicinity of the wound. ‘These are followed 
by the warted, button-like reddish growths, and the tree 
goes from bad to worse. As this is one of the fungi 
requiring not even a glass to sce its beautiful stromata, 
it should be readily recognised, and preventive measures 
adopted. The importance of at once dealing with bark- 
wounds caused by frost, hail, as well as by implements, 
will be apparent. The best application is a smear of tar. 
When, however, branches die, and the presence of the 
fungus is noted in their vicinity, such dead portions 
should be cut away directly they are seen, and burned. 
Fallen branches and twigs should be also burned. This 
fungus is parasitic as well as saphrophytic. 
One of the chief insect depredators to Maple foliage is 
a species of Sawfly, Phyllotoma aceris, whose larvee are 
leaf-miners. Their presence may be indicated by an 
irregular blotch, especially if the leaf or leaves be 
carefully examined. The larve are usually feeding at 
midsummer, or a little earlier. Little can be done at that 
time, though later, when in the pupa-stite, the cocoons 
may be collected from the tree-trunk and burned. These 
Sawflies seem most partial to Acer Pseudo-platanus. 
Other insects in the form of the ubiquitous Vapourer 
Moth Caterpillar (Orgyia antiqua) also attack the trees, 
especially in towns; and where a good force of water can 
be applied, as from a stand-pipe or powerful engine, a 
good washing several times during a very dry summer 
would be useful in dislodging such pests. 
ACERANTHUS (from Acer, the Maple, and anthos, a 
flower; the flowers resemble those of the Maple). Orn. 
Berberidex. A monotypic genus. The species, A. 
diphyllus, is a hardy herbaceous perennial, with a creeping 
rhizome, also known as Epimedium diphyllum (under which 
name it is deseribed in Vol. I.). Sepals seven or eight, re- 
sembling the petals, the outer ones rather smaller ; petals 
flat ; stamens four, free. Stem one-leayed, racemose at apex. 
ACERATIUM. Bentham and Hooker include this 
genus under Bleocarpus (which see). 
ACERINEZ. The Acerinex are now regarded as a 
sub-order of the Natural Order Sapindacee. It embraces 
the well-known genera Acer and Negwndo (the latter now 
included under Acer. Flowers regular. Leaves always 
opposite, simple or pinnately three- to five-foliolate. 
