= 
en ee ee ee, 2.) ea ee 
1900 SUPPLEMENT—RECENT INTRODUCTIONS, &C. 15 
Acrostichum—continued. 
haft, blunt or acute, entire, naked. fertile fronds 6in. to 12in. 
long, fin. to din. broad, on stipes often lft. long. India. 
A. variabile, of Fée. A variety of A. sorbifolium. 
A. villosum. This species is very variable ; among the principal 
‘deviations from the type may be named A. Plumieri, A, setosum, 
and A. undulatum. 
A. virens (green). rhiz. hard, woody, short-creeping. sti. firm, 
erect, without scales. 
barren fronds coriaceous, 2ft. to Sft. 
long, often lit. 
broad; lateral 
innz 6in. to 8in. 
ong, about lin. 
broad, the edges 
bluntly lobed or 
sometimes sinu- 
ate; terminal one 
twice as long, 
generally —root- 
ing at the point. 
Tropical Asia. 
SYN. _Gymnop- 
teris virens. 
very robust and 
decorative spe- 
cies, of which 
the following are 
merely forms: 
a contaminans ; 
. costatum, pin- 
ne 8in. to Din. 
long, 2in. to din. 
broad, tinged 
with red; A. 
erispatulum, pinnz narrow, crisped, very Coriaceous; A. pro- 
liferum, pinne broad; and A. terminans. 
ACROTREMA (from akros, a point, and trema, a 
perforation ; the pollen is shed through a hole at the tip 
of the anthers). Orp. Dilleniacez. A genus consisting of 
about a dozen species of almost stemless, stove or green- 
house herbs with a perennial or woody rhizome, natives of 
India, and especially plentiful in Ceylon. Flowers yellow ; 
sepals five, spreading; petals five; filaments more or 
less aggregated in three bundles; peduncles axillary, 
loosely few - flowered or racemosely many - flowered. 
Leaves ample, pinnately lobed or dissected. For culture 
of A. Walkeri, the only species introduced, see Delima. 
A. Walkeri (Walker's). /. in very short, axillary racemes ; 
stamens about fifteen; pedicels lin. to 2in. long, laxly villous. 
June. J. narrowly obovate-oblong, bullate, 2in. to 4in. long, 
4in. to lin. broad, sharply toothed, auricled at base, dull red 
ae ee ee ee beneath. Ceylon, 1851. Warm green- 
a a alec ACTHEA. This 
genus embraces only 
the two species de- 
scribed on pp. 20-21, 
Vol. I., A. spicata 
(Herb Christopher) 
being broadly dis- 
tributed over North 
temperate regions and 
indigenous in Britain. 
Several plants for- 
merly included here 
are now referred to 
Cimicifuga. 
A. dioica (diccious). 
A synonym of Xan- 
thorrhiza apitfolia. 
A. palmata (palmate). 
A synonym of Y'raut- 
vetteria palmata. 
ACTINELLA. 
Picradenia is synony- 
mous with this genus. 
ACTINIDIA. 
About eight species, 
natives of the Hima- 
layas, China, and 
Japan, are included 
hereunder. 
Fic. 16. ACROSTICHUM PELTATUM. 
Fic. 17. ACTINIOPTERIS RADIATA 
ACTINIOPTERIS. ‘The very decorative and at- 
tractive A. radiata (Fig. 17) and A. r. Australis (Fig. 18), 
with their striking Palm-like fronds, are erroneously 
considered as very difficult to manage, consequently 
they are not grown as extensively as they really de- 
serve; they are most interesting, though of compara- 
tively small dimensions. Failure in their culture must, 
in many cases, be attributed to the excessive heat to 
which they are subjected, which causes them to get 
“thrippy” and lose their vitality; but when kept in 
a temperature of 60deg. in the winter, raising to 70deg. 
in the summer, with constant moisture around them, 
they remain perfectly clean and healthy. They thrive 
best in fibrous peat, fibrous loam, broken in small pieces, 
coarse silver sand, and small crocks, in about equal 
proportions. It is also absolutely necessary that the 
pots in which these Ferns are grown should be _half- 
filled with crocks, so as to insure perfect drainage, 
for they require frequent and abundant waterings to keep 
their roots in a permanently moist state all the year 
round. Being devoid of rhizomes or stems of any kind, 
Actiniopteris are usually propagated from spores, which 
germinate very freely when sown on a compost of brick- 
dust mixed with 
a little loam, 
and kept in a 
warm, close 
case. They may 
also beincreased 
by the division 
of the crowns; 
but this opera- * 
tion, which 
should be done . 
not later than 
the beginning 
of March, is of 
a somewhat 
risky nature, 
and requires a 
certain amount 
of experience 
and a good deal 
of attention to ensure the separate pieces getting 
established. , 
, ACTINOCARPUS. The correct nanre of this genus 
is Damasonium (which see). 
ACTINOCHLOA. A synonym of Bouteloua (which 
see). 
ACTINOLEPIS. Syn. Hymenorys. This is the 
correct name of the genus described on p. 247, Vol. TI1., 
as Ptilomeris, and P. coronaria is properly known as 
A, coronaria. . 
ACTINOMERIS. Syn. Ridan. About nine species, 
natives of North America (including Mexico) comprise this 
genus. 
A. alata. The correct name is Verbesina occidentalis. 
A. procera is synonymous with A. squarrosa. 
ACTINONEMA ROSZ (Syn. Asteroma radioswm). 
A fungus responsible for the irregular black spots 
frequently seen on the foliage of roses in summer, causing 
it to turn yellow and prematurely fall in very bad attacks. 
Later these spots increase in size, and assume a more 
definite rounded form. Beyond removing the leaves and 
bare shoots and burning them little can be done, as the 
mycelium is in as well as upon the foliage. Where Roses 
are grown, and the disease was known to exist the 
previous season, it will be well to spray in spring, using 
a weak solution of Bordeaux Mixture (which see). 
ACTINOSTROBUS (from aktin, a ray, and strobos, 
a cone; in allusion to the disposition of the cone-scales). 
Oxp. Coniferz. A small genus (two species) of greenhouse, 
Fic. 18. ACTINIOPTERIS RADIATA AUSTRALIS. 
