VOLUME LXXIV NUMBER 2 
THE 
BOTANICAL GAZETTE 
October 1922 
HETEROTHECA GRIEVII THE MICROSPORANGE 
OF HETERANGIUM GRIEVII 
MARGARET BENSON 
(WITH PLATES 1V, V, AND EIGHT FIGURES) 
Introduction 
The sporangia here described have so far only been recorded 
from the Pettycur deposits of the Calciferous Sandstone Series of 
Scotland. They have been found in three blocks, one of which, 
presented to the writer by Professor BAYLEY BALFouR in 1905, 
yielded also some of the specimens of Sphaerostoma of which a 
description has already been published (5); the other two blocks 
were collected at Pettycur by the writer in 1910. In all three 
blocks they were found associated with Heterangium Grievii. 
Their somewhat flattened fusiform shape is approximately that of 
Telangium Scottii (4), but the dimensions are less. T. Scotti 
measures about 23mm. in width at its maximum girth and 
4mm. in length, whereas the new sporange only measures roughly 
1X2 mm. in width and 3.5-4mm. in length. -A further resemblance 
to Telangium is their possession of longitudinal loculi or series of 
loculi, and of peripherally placed tracheids. These resemblances 
do not seem adequate to suggest its inclusion in this form genus, 
because there are many remarkably distinctive characters in the 
new form. 
In the first place, each peripheral loculus of Telangium is 
represented in Heterotheca by a series of relatively small loculi. 
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