NOTES 
THE FRUCTIFICATION OF LYGINODENDRON OLD- 
HAMIUM. — In many of the slides recently prepared by Mr. Lomax 
from a large Dulesgate block, I have detected sporangia which seem 
to have every mark of belonging to Lyginodendron, short of direct 
continuity with the petiole. In five of the slides the sporangia are 
aggregated together in clusters of eight, being coherent at the base, 
though free at the apex. They are about 4 mm. in length and 1 mm. 
in width, and they taper 
to the apex and slightly 
to the base. Transverse 
sections of clusters at 
three different levels show 
that the periphery of the 
cluster is surrounded with 
tissue of the characteristic 
structure of the Lygino- 
dendron pinna. The epi- 
dermis, hypoderm and 
lacunar tissue are all pre- 
sent at the base of the 
cluster, while the two 
former continue to the 
apices of the sporangia. 
Thus each sporange has 
the exposed part of its 
wall thicker than that towards the centre of the cluster. These 
clusters are associated in all five slides with small petioles of Lygino- 
dendron. 
The form and size of these clusters strongly suggest the Calyrn - 
matotheca type of fructification, which has been made familar to all 
in the frontispiece to Dr. Scott’s ‘ Studies in Fossil Botany.’ The 
arguments in favour of this being the fructification of Lyginodendron 
are clearly stated in this work. 
[Annals of Botany, Vol. XVI. No. LXIII. September, 1902.] 
Fig. 31. Tracing of photograph of a longitudinal 
section (x 12), 
