394 
GLASS HOUSES. 
See Conservatory, Green- 
house, Orchard House, Orchid House, Vinery 
(under Vine), &c. 
GLAUCIUM. Sepals two; petals four; stamens 
indefinite. To the information given on p. 71, Vol. IL., 
the following should be added : 
G. corniculatum phceniceum., 
G. pheeniceum. 
G. Fischeri (Fischer’s).* ji. flame-coloured. 7. 
snow-white wool. A handsome species. 
G. squamigerum (scale-bearing). fl. yellow, ljin. in diameter ; 
capsule covered with scales. J/., radical ones lyrate, pinnatifid, 
cauline ones few, minute, sessile. Altai Mountains. 
GLEDITSCHIA. To the species described on p. 72, 
Vol. II., the following shonld be added : 
G. carolinensis (Carolina). 
G. ferox (fierce). 7. bipinnate; leaflets lanceolate, 
Spines trifid, much compressed. hk. 18ft. to 20ft. 
Probably a form of G. macracantha. SYN. G. orientalis. 
G. orientalis (Eastern). 
GLEICHENIA. Including Mecosorus and Mertensia 
(of Willdenow). There is no British representative of this 
genus, which, however, is widely distributed. One species, 
G. dichotoma (Fig. 415), is particularly widely dispersed, 
being found in the New and in the Old World, in the 
Pacific Islands, and as far north as Japan. 
CuituRE. In the majority of cases cool treatment is the 
most suitable for Gleichenias, and with very few exceptions 
they fare best in a house where during the winter the 
temperature falls as low as 45deg. In fact, most, if not all, 
of the failures experienced in the early attempts at 
cultivating these charming plants may be traced to the 
The correct name of 
covered with 
A synonym of G. monosperma. 
acute, 
China. 
A synonym of G. ferox. 
Fic. 413. 
KELWAY’S HYBRID GLADIOLI, 
THE DICTIONARY 
OF GARDENING, 
Gleichenia—continued. 
Fic. 414. 
A GROUP OF HYBRID GLADIOLI, 
pernicious practice of growing them in too much heat— 
treatment which causes them to make stunted growths, 
generally full of thrips and seale. Besides the house being 
at most what is usually called intermediate, it should also 
be light and well ventilated. Bright light is indispensable 
in the culture of Gleichenias ; they will even withstand a 
little sunshine during the morning and the afternoon, and 
be benefited by it. Light, in fact, is of such importance 
that if a plant in perfect health be placed under, say, Tree 
Ferns, or under any other plant that will permanently shade 
it, it will soon retrograde, and show by its spindly growth 
that it does not at all appreciate the presence of neigh- 
bours taller than itself. It is also worthy of note that 
snecess cannot reasonably be expected unless these plants 
are in a perfect state of cleanliness. 
The plants comprised in the section Eugleichenia 
are provided with rhizomes of a particularly slender and 
naturally hard nature. They are very shallow rooters, 
and when not planted ont should be grown in rongh, 
sandy peat, in pans. Their rootlets being short and 
exceedingly brittle, it is necessary that the rhizomes 
from which they are produced should receive special 
attention at the hands of the enltivator; and as these 
haye a particular objection to being buried underground, 
they must be carefully kept on the surface by being 
pegged on the potting material, which must be made 
firm, if not altogether hard. It is therefore indispensable 
that the plants should have abundance of pot-room, so 
as to give the rhizomes every facility for spreading. The 
pans should be well drained, as, stagnant moisture at the 
roots is injurious. 
Not only do the plants belonging to the Mertensia 
section differ from the others by their general appearance, 
but they are provided with rhizomes of a totally different 
nature, being fleshy, brittle, much stonter, and nsually 
root deeply into the ground of their own accord. For 
these, a mixture of two parts fibrous peat, one part 
fibrous loam, and one part of sand is preferable to the 
