BOTRYOPTERIDEAE 503 
The spores are of approximately uniform size, and the plant appears to 
have been homosporous. 
The sporangia of Botryopteris Jorensis have also. been observed: 
they are of smaller size, and have the broad annulus on one side only. 
But in other respects they resemble those of Zygoplerts. 
Fic. 272. 
Zygopterts, sp. 1%, group of four sporangia on a common pedicel (a). X10. 2, two 
sporangia on pedicel. The upper shows the annulus (c) in surface view, with spores 
exposed at_/; the lower in section. 20. 2 d/s, sporangium cut in plane of annulus. 
3, group of sporangia in transverse section. 20, Lettering common to the figures. 
a, common peduncle; 4, sporangial wall; c, annulus; ¢, tapetum (?); 4 spores; 7, 
pedicel of individual sporangium; 2, probable place of dehiscence. All after Renault. 
(From Scott’s Studies in Fossil Botany.) 
A particularly interesting fructification attributed to this affinity is 
that described as Corynepteris (Fig. 273). Hitherto it is known only 
in the form of impressions. The leaves were of the Sphenopteroid, or 
Pecopteroid type, and the pinnules bore each a single sorus, of five 
to ten sporangia, grouped round a common centre. The annulus is 
here again a broad lateral band, consisting of several cell-rows: as the 
sporangia are grouped in the sorus: the annulus of each sporangium is 
in juxtaposition with that of its next neighbour, a condition not unlike 
