EXPLANATION OF THE ILLUSTRATIONS 
Figure at upper left. Coponotueca capuca Sellards. The 
cluster of carbonized spores has been peeled from an 
incrustation. Magnified 44 times. Carboniferous: Mazon 
Creek, Illinois. Thompson Collection. 
Figure at upper right. CrossoTHECA SAGITTATA (Les- 
quereux) Sellards. This peel shows a mass of spores from 
a carbonization. Magnified 60 times. Carboniferous: 
Mazon Creek, Illinois. Thompson Collection. 
Figure at lower left. Corparanruus sp. The peel shows 
the longitudinal section through a female *“flower”’ 
with sterile bracts at the base. Magnified 24 times. 
Carboniferous: Mazon Creek, Hlinois. Thompson Col- 
lection. 
Figure at lower right. PaLteomycrs sp. This peel taken 
from a necrotic area ina silicified stem in Rhynia major 
Kidston and Lang shows the diseased tissue and sev- 
eral small spores around the periphery in the *‘velati- 
nous’’ sheath. Magnified 60 times. Devonian: Rhynie, 
Scotland. 
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