EXPLANATION OF THE ILLUSTRATION 
Prare LXIL. Stelar organization in the genus MWedullosa, continued, 
Figs. 1-7. Carboniferous species. These, with the addition of those 
figured on Plate LXI, fi 
boniferous species, with the exception of W. Noe’. ‘he stelar pattern 
ys. 10 and 11, represent all the known Car- 
ot M. Noe? does not resemble that of .W. Olseniae, and is omitted from 
the figures because of its large size. Figs. 8-11 show the known Per- 
mian species from Germany. 
Fig, 1, M,. e/ongata Baxter. From Baxter. ~ 1.8 
Fie. 2.) M. centrofilis De Fraine. From Baxter, after Andrews. ~ 1.8 
Fig. 3. M. primaeva Baxter. From Baxter. > 1.8 
Fie. 4. M. anglica Scott. From Baxter, after Andrews. 0.70 
Kie. 3. M, endrocentrica Baxter. From Baxter. 1.8 
Fig. 6. M. pandurata Stewart. From Stewart. ~ 0.70 
Fie. 7. M. Thompson) Andrews. From Baxter, after Andrews, 1.8 
Rig. 82M. Leuckartii Goppert and Sterzel. This and the following 
diagrams show the characteristic peripheral ““steles** and accessory 
secondary woody cylinders with included “‘star rings** which are 
found in the Permian species. This stelar organization is more com- 
plex than is found in the Carboniferous species, and is clearly more 
specialized. From Weber and Sterzel. O75 
Fie. 9. M. porosa Cotta. From Weber and Sterzel. » 0.75 
Fie. LO. M. ste/lata Cotta. From Weber and Sterzel. 0.70 
Bie. Ll. MM. So/msii Schenk. From Weber and Sterzel. © 0.75 
