232 MR. HENRY RIDLEY ON ORCHIDER AND 
stem, and the terminal nodes of each branch dilated into a 
terete or flattened pseudo-bulb, bearing a single (rarely and 
only exceptionally a second) leaf. 
Bolbidium is retained as a section for a few plants with a 
distinct but short primary stem and paucinodal pseudo-bulbs 
bearing a pair of leaves. 
The remaining species have a very short primary stem and 
tufted polynodal secondary stems, which are but seldom 
branched. Many species emit lateral shoots when the terminal 
bud is destroyed, and several species normally emit lateral 
shoots, such, for instance, as Dendrobium inconcinum, Ridl., 
and D. prostratum, Ridl., which latter, though closely allied to 
the tufted crest, D. (§ Aporum) Teonis, Reichb. f., has taken on 
a creeping habit, and emits roots from the underside of the 
stem and branches in every direction. Most of the species have 
terete or more or less compressed secondary stems, rarely 
dilated into pseudo-bulbs properly so-called. The section 
Clavate has some of the lower internodes swollen into a 
fusiform shape. D. lamellatum, Lindl,, has a shortened 
polynodal stem, broadly dilated upwards but very thin. I 
have referred it to the Pedilonum section on account of the form 
of its flowers. 
The whole of this series can be broken up into those with 
persistent leaves, z.e, that bear flowers on the leafy stems and 
those that bear them on the old stems only after the leaves 
have fallen. To the first series belong— 
Aporum, Blume, with its flattened stem and leaves; 
Strongyle with subterete acute leaves ; 
Virgate with a tall, slender stem and narrow linear leaves ; 
Clavate with stems similar to the last, except that several 
nodes at the base are more or less swollen; 
Distichophylle with stout stems with usually short distichous 
leaves, and a very distinct form of flower 
Breviflores resembling the next series, but with the terminal 
leaves persistent, and short broad flowers—not a very good 
section. 
Of the large series with the flowers borne on leafless stems, 
Pedilonum is distinguished by its long mentum and compara- 
tively short sepals and petals, but there are many species 
intermediate between typical Pedilonums (such as D. secundum, 
Lindl.) and the remaining section Eudendrobium. 
