164 THE ORCHID REVIEW. [JUNE, 1910 
described, but none are known to be in cultivation. The pollinia are 
recorded as six, attached to a small viscus. 
Octomeria resembles Pleurothallis in many respects, but has eight pollen 
masses. The flowers are almost invariably borne in fascicles, as in Pleuro- 
thallis section Aggregatz, to which the resemblance is in some cases very 
close until the pollinia are examined. Over 60 species are known, the 
majority being Brazilian. 
The two remaining genera placed here by Bentham are somewhat 
anomalous, but agree with Octomeria in having eight pollinia. Meiracyl- 
lium contains a single Mexican species, M. gemmz, having broad sessile 
leaves at the nodes of the creeping rhizome, and few, terminal, rose-purple 
flowers, which are borne on short peduncles. The pollinia are united by a 
viscus, and the. rostellum is recurved over the column. Arpophyllum has 
long cylindrical spikes of rose-coloured flowers. There are three or four 
species, natives of Central America and Jamaica, one or two being in 
cultivation. 
The subtribe Lzeliez, as defined by Bentham, is characterised by having 
the pollinia laterally compressed and extended into linear pollinary caudicles, 
often more or less united. They may be either four in a single series, as in 
Cattleya, or eight in two series, as in Lelia. The species are mostly 
epiphytic, and the stems frequently swollen into pseudobulbs, though in 
many Epidendrums the stems are elongated, and bear numerous distichous 
leaves, as in some of the Dendrobiums. Bentham recognised sixteen genera, 
to which two or three have since been added, and the species known reach 
a total of over 600.. 
Several of the genera of Leliez are well represented in cultivation, 
Cattleya, Lelia, Sophronitis, and a few species of other genera being among 
our most popular garden plants. Ten of the genera have four pollinia only, 
but of these Alamania, Pinelia, Pleuranthium, Ponera and Hartwegia are 
either not in cultivation or very rarely seen. One species of Isochilus, I. 
linearis, is occasionally met with, and has slender stems, distichous leaves, 
and terminal spikes of narrow purple flowers, with partially united seg- 
ments. Diacrium is a small genus with swollen pseudobulbs, which in a 
wild state are tenanted by ants. D. bicornutum is well known in gardens 
for its beautiful white flowers, which approach those of Epidendrum in 
structure, a genus in which it was originally included. 
Epidendrum is a very large and polymorphic genus, including some 500 
species, some being. pseudobulbous, with few leaves, and others having 
slender stems with numerous distichous leaves. In the majority the lip is 
adnate to the column, but in some it is free, with various intermediate 
‘states. The flowers vary enormously in size, shape, and colour, and the 
pollinia, are much like those of Cattleya. The genus ranges from the 
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