382 ORCHIDE. 
The construction of this tribe of Orchidez is as follows:— 
3. Sepals. 
3. Petals. 
1. Stamen imperfect. 
` 2. Stamina imperfect. 
3. Carpellary leaves. i 
The posticous stamen of the inner series. А 
The two lateral. stamina of the outer. -... | Are wanting. 
The costz of the ovary corresponding to the sepals, are 
not completely separated from the others. 
In addition to Mr. Brown’s objection relating to the si- 
tuation of the placenta, I may add that if the carpellary 
leaves be considered as 6, then the placenta of each fertile 
carpellary leaf must be considered as distinct, which is con- 
trary to all analogy, for no instance is known of a. compound 
ovarium having simple placente. 
No instance is known of which the placente of a com- 
pound ovarium are not themselves compound, 
he Rhizomas of this plant consist chiefly of cellular tis- 
sue, most lax towards centre. 
Most of the cells of the laxer part have sticking to one 
side generally the inner ? a greateror less heap Amylaceous 
granules, acted оп by Iodine, and besides are gorged with 
minute granular matter, this is rendered brown by Iodine. 
The outermost row has no contents and is 1-вегіаќе, ap- 
parently at right angles with the rest. 
The amylaceous granules or cells towards the circumference 
are few and generally not aggregate. 
The rhizomata of Pogonia are plicate and also abundant in 
amylaceous granules of larger size, but in this with the ex- 
ception of a zone nearest the circumference, they are chiefly 
irregularly distributed along the course of the vessels, cells 
gorged with very minute granular matter also exist and per- 
haps independently of those amylaceous ones. 
T is not much distinction between the structure of the 
leaf in Pogonia. 
