sents a longitudinal view of a sporangial mass. The very 
numerous pyriform sporangia are grouped around the 
ultimate divisions of a much-branched axis. The arrange¬ 
ment of sporangia can be seen in the upper right quadrant 
of the illustration. 
The lower figure on the first plate shows a cut sur¬ 
face, sawn within a few degrees of a right angle to the 
axis. Here again we can observe the prodigious number 
of sporangia and the enormous size of the fructification. 
On the second plate there is illustrated a small por¬ 
tion of a section taken diagonally through the axis. It is 
nearly transverse and shows the petiole giving off a 
branch. The stele of the petiole has the characteristic 
trident-shape which is known to be a generic character. 
The sporangia here seem to have walls which are only 
one cell in thickness, but this is due to incomplete pres¬ 
ervation. There is an annulus which is evident on several 
of the sporangia near the top right. 
The figure on the third plate shows a longitudinal 
view through a mass of sporangia and through the peti¬ 
ole or axis. At the lower left, a group of five (six ?) spo¬ 
rangia are clustered around a pedicel. A similar cluster 
is shown at the top right. 
The figure on plate four shows portions of seven spo¬ 
rangia—three of them nearly complete. 
The number of spores in each sporangium is large 
several hundred being a minimum estimate. 
The sporangia on plate five show clearly the crowded 
condition of the sporangial mass and the relative size of 
the spores. Near the top left corner the sporangium ad¬ 
jacent to the limb of the petiole shows the annulus. A 
number of the sporangia show the rather decomposed, 
at least poorly preserved, inner cell layer. The sporan¬ 
gium at the bottom center, and several near the true 
center of the illustration, reveal this moderately well. 
[ 161 ] 
