126 BOTANICAL GAZETTE [OCTOBER 
contents, a condition which is possibly the result of the conditions 
to which the sporange was exposed during fossilization. As a 
rule the spores are better preserved in the interior than near the 
surface, which may be due 
to the conditions of ex- 
posure being slightly 
“& 0) — different. In a large 
number of cases the con- 
G. 5.—Camera drawings of “ayia from s of the loculi have 
vice iC oo siael Oh ek kee 
middle is characteristic and possibly eae entirely been dissolved, 
residuum of spore mother still persisted as in Or are in an abnormal 
recent cycads; spores on left drawn from those condition. Such are the 
pt gnc aa of Sphaerostoma for comparison series CN .383.10-13 an 3 
CN .386.11~-12 (figs. 1-4). 
In the series CN .391.23-27, slide 391.26 shows in two cases a 
nerve ending in the center of the abortive loculus. In a large 
number of cases the peripheral loculi have been carbonized, but not 
the central ones. 
Swollen nerve end- 
TRAL LocuLys 
CEN im , 
fiq4 SiR’ 
angium sclerotic 
plates appear to 
occupy the whole 
of the core of the 
sporange in the 
most advanced 
phyllodic  speci- 
mens (text fig. 7). 
I refer to the par- 
talks Ge ent) Fic. 6.—Key to fig. 12, showing outline of sclerotic 
‘fi my plates, trig which are ase | in slide than in micrograph. 
ATE on WALL. 
of Locuuus<¢. Text 
abortive specimens 
““phyllodic,” as their tissues approximate the tissue elements 
of the ordinary sterile petiole of Heterangium. Moreover, they are 
linked together as in the petiole. There is a considerable range 
of form and size in the plates; some sporangia even seem to have 
produced more plates than others (fig. 12). 
