6o8 Church . — Neomeris dumetoso , L amour. 
portion ; partly cleared. The dichotomy in a transverse plane is less regular than 
in Stage IV. Half the members in a whorl undergo displacement at the surface, 
rendering the facetting less symmetrical. Number of members in a whorl, 30-32. 
Depth of shading indicates amount of calcification. 
Fig. 25. Older portion of thallus after disintegration of cortex. The calcified 
aplanosporangia and calcified basal segments only left. These latter decalcify and 
persist some time. Many of the aplanosporangia also decalcify and exhibit no 
contents, but no rupture in the wall ; possibly sterile. 
Fig. 26. Portion of transverse section, cleared and stained with Hoffmann’s blue 
to show chlorophyll-corpuscles. Diagonal shading indicates the region of calci- 
fication in the mucilaginous sheath. 
Fig. 27. Mature aplanosporangium enclosing a single spore, (?) gametangium. 
This latter invested with a thick cell-wall distinct from the thin membrane of the 
aplanosporangium. Contracted contents allow the wall to be clearly defined. 
Fig. 28. Young plant in Stage IV, just commencing calcification. 22 mm. 
Fig. 29. Adult plant in reproductive stage. Spirit specimen showing region of 
cortical calcification and apical coma of filamentous appendages. Below, the 
disintegrating cortex exposing the densely calcified aplanosporangia. Further back 
the scanty remains of basal segments. 35 mm. 
PLATE XXIII. 
The whole Zeiss 3 D. and reduced § . 
Fig. 30. Basal segment of leaf bearing aplanosporangium. Calcified. 
Fig. 31. The same decalcified, showing mucilaginous outer layer of wall and 
contents of aplanosporangium rounding off to form a spore. Also delimitation by 
T-shaped cellulose plug, not found in other septa. 
Fig. 32. Median longitudinal section of apical bud of adult plant. Continuous 
cortex formed at node 9. At node 14 the cortical segments begin to assume 
globular extremities. First dichotomy in transverse plane, irregularities in 
facetting by displacement arise later. 
Fig- 33- The same series of appendages in tangential view; bifurcation of 
Stage IV in 2. First sign of gametangium, as also delimitation of the cortical 
segments in 6. The full filamentous portions not shown. Cleared in HC 1 and 
Eau de Javelle. 
