AN ENCYCLOPADIA 
OF HORTICULTURE. 117 
Tussilago—continued. 
T. Farfara variegata (variegated Coltsfoot).* I large, broadly 
cordate, angled or lobed, toothed, margined or blotched with 
creamy-white. A pretty plant, but not one which should be in- 
discriminately introduced into gardens, as its creeping roots give 
much trouble at times. See Fig. 136. 
TUSSOCK MOTHS. Species of Bombycina, nearly 
related to the Vapourer Moths (see Orgyia antiqua). 
By some entomologists they are included in the genus 
Orgyia; but most separate them from that genus because 
the females of the Tussocks have full-sized wings, while 
those of the Vapourer Moths are almost wingless. The 
Tussocks are placed in a genus named Dasychira (from 
dasus, hairy, and cheir, the hand, or fore limb; in allusion 
to the hairs on the first pair of legs). There are two 
British species, generally known as the Pale Tussock 
(D. pudibunda), or Hop-dog, and the Dark ‘Tussock 
(D. fascelina). The males have the antennz much fringed; 
while in the females they are nearly simple. In both sexes 
the body is heavy, and the wings are rather broad. The 
The 
front pair of legs are hairy, especially in the male. 
larvæ resemble those of the Vapourer Moths in 
. having erect, brush-like tufts of hair on the 
middle line of the back, from the fifth to the 
eighth segments, and a backward-pointing tuft 
on the back of the twelfth segment. When 
full-fed, the larve spin slight cocoons among 
their food-plants, and become hairy pupæ. 
The Pale Tussock (D. pudibunda) is about 
2in. or 2jin. in spread of the fore wings. Its 
general colour is grey, with three narrow, dark 
bands across the fore wings; or, in the male, 
a broad, smoke-coloured cross-bar, with darker, 
waved lines. The hind wings are pale grey, 
with a faintly darker bar. The larva is pale 
green, with a deep black, velvety band on the 
back between each two segments from the fifth 
to the eighth; the tufts of erect hairs on the 
back are yellow. The larve live on many trees, 
such as Beech, Chestnut, Lime, and Oak, and 
they also feed on Hops, whence the name 
* Hop-dog," often applied to them. 
The Dark Tussock (D. fascelina) seldom ex- 
_ ceeds lłin. across the front wings, which are 
smoky-grey, with three wavy, blackish cross- 
bars; two of these lie close together beyond the 
middle of the wing. The hind wings are smoky- 
grey, as are also the head and body. The larvæ 
are dark grey, with lemon-yellow hairs, but the 
tufts on the back are nearly black instead of 
yellow. The larve feed occasionally on Plum 
and other fruit-trees, on Hazel, Heather, Oak, 
and various herbs. They are, however, seldom 
the cause of serious injury, hardly ever being 
abundant. : 
Remedies. Hand- picking, or shaking the 
larvee from the branches on to sheets of paper 
or cloth, will prove sufficient to prevent harm, 
should it be threatened at any time. 
TUTSAN. See Hypericum Androsz- 
mum. 
TWEEDIA. A synonym of Oxypetalum 
(which see). ' 
TWIN FLOWER. See Bravoa gemini- 
flora, 
TWISTED STALK. Se Streptopus. 
TYCHIUS QUINQUE-MACULATUS. Larvæ of 
a Weevil known by this name feed in the seeds of Peas 
and other Leywminose. During summer, when full-fed, 
they fall to the soil, and become pups in it. The 
Beetles emerge from the ground in autumn, live in con- 
cealment during winter, and, in summer, the females 
lay eggs in the flowers, or, rather, in the ovaries of the 
| 
| 
Tychius quinque-maculatus—continued. 
flowers, of the food-plants. The Beetles are about iin. 
long, and are elongate-ovate in form. The beak is long, 
and curves downwards ‘The colour is black, with ruddy 
or yellow scales above, a white line down the middle of 
the thorax, and a white spot, and white inner border, 
on each wing-case; the body is pure white below. The 
thighs are toothed, and black; the rest of the legs, 
and the antennz, are dull-red. The Beetles are not 
very common in England, which is fortunate, as it is 
difficult to apply a remedy—at least, while the larve are 
in the pods. A dressing of soot along the rows of Peas, 
towards the end of summer and autumn, would probably 
be of service against the pupæ in the soil. 
TYDZEA (named after Tydeus, a son of (Eneus, King 
of Calydon) ORD. Gesneracew. A small group of stove 
herbs, natives of tropieal Ameriea, now included under 
Isoloma. The species hybridise freely, and many crosses 
have received distinctive names in continental gardens. 
For culture of the plant described below, see Gesnera. 
‘Fig. 137. UPPER PORTION OF PLANT OF TYD.EA AMABILIS. 
T. amabilis (lovely. d. dark rose-coloured ; corolla large, very 
villous, the limb of five unequal, rounded lobes, dotted with — 
purple, the oblique tube paler-coloured within, but marked with 
larger dots and blotches ; uncles axillary, solitary, as long as, 
or the upper ones much longer than, the leaves, erect, purple 
below. Spring. J. opposite, ovate, bluntly serrate-toothed, 
somewhat acuminate, dull green above, pale beneath. Stem lft. 
to 2it. or more high,- M eure New Grenada, 1855. 
Whole plant hairy. See Fig. 7. (B. M. 4999.) ` 
ae 
