512 ORCHIDS. 
blotches of brown. ‘The lip is 14in. across, wavy, narrowed 
to a stalk-like base, and coloured bluish white, with ra- 
diating, broken lines of purplish blue; the disc is fleshy 
and white; the column is thick, winged, and coloured green 
and white. The flowers are produced in winter, and last 
for about two months. Introduced from Brazil in 1844. 
Sander’s Reichenbachia, t. 16. 
Z. Mackaiii—The general character of this plant is 
described under Z. intermedium. The flowers are smaller 
than in Z. intermedium, the sepals and petals pale in 
colour, the lip smaller and quite glabrous, whilst the 
radiating, vein-like lines are coloured deep blue; the 
crest, also, is two-lobed. So far as we can learn, the 
true Z. Mackaii is very rare in cultivation; it is, however, 
so very similar to the two commoner ones, viz., Z. inter- 
medium and Z. crinitum, that, except for botanical collec- 
tions, the one may do duty for the other—as, indeed, they 
already often do. Z. Mackaii was introduced from Brazil 
in 1827. The genus was founded upon it by Sir William 
Hooker. 
Botanical Magazine, t. 2748. 
Z. maxillare——An old garden favourite, known as the 
Tree-fern Orchid, from the fact that it is commonly found 
growing wild upon the stems of tree-ferns, and is often 
imported with them. We lately saw some fine examples 
of it growing upon living tree-ferns in the Jardin des 
Plantes, Paris, the effect produced by its richly-coloured 
flowers against the brown scales of the fern-stem being 
particularly good. The rhizome is stout, creeping, and 
bears ovate pseudo-bulbs 2in. long, each with two or three 
leaves 1ft. long, tin. broad, with conspicuous nerves. The 
scape springs from the base of the ripe pseudo-bulb, and 
is gin. long, with from six to eight flowers, each rin. 
