and its Mycorhiza. 329 
Above is the short membranous filament which is attached 
both above and at its sides to the top of the tube of the 
perianth. So the filaments form six little dome-like chambers 
which stand over the six anthers. A transverse section taken 
through this region would show that there are two wings 
to the filament which already denote the method of formation 
of the staminal tube. Lower down, these wings meet and 
form a tube, and the pollen-sacs opening outwards (towards 
the perianth-tube) are visible. Below the anthers the fused 
wings continue, and form six furrows between the thickened 
ridges which are continued down from the anthers. In the 
middle of the furrows are long hairs which, I imagine, serve 
to catch the pollen. Descending lower the ridges become 
winged, and the two wings of the adjacent ridges tend to 
arch over the furrows. Below this the wings increase in size, 
and form six small tunnels in which lie the six nectaries. 
Each discoid nectary consists of a single layer of palisade- 
like, deeply-staining cells. Half of the disk belongs to one 
stamen and half to an adjacent one, and the line of fusion 
of the two stamens is recognizable, as is the distinct curva- 
ture of the nectariferous cells (Fig. 18). At the upper end 
of the tunnel the wings have long hairs which help to roof in 
the cavities in which the nectaries lie. Lower down the 
nectaries are replaced by hairs in the middle of the furrows, 
and the staminal ridges become much changed. They form 
curved plate-like outgrowths, attached above and at the sides, 
so that six little flattened dome-like chambers are formed 
closed above but open below. The median free part of this 
curved plate-like outgrowth hangs down and is rolled slightly 
inward and has conspicuous long hairs at its margins. Con- 
tinuing downwards, only the lateral walls of this open chamber 
persist. The staminal tube therefore exhibits at this point 
twelve little channels, the broader ones representing inter- 
staminal radii, and the narrow ones the staminal radii. Below 
the connectives separate, and the lateral walls already men- 
tioned end in conspicuous strong teeth or pegs. The median 
portion of the connective persists lower and tapers to a fine 
