PLATE 2. — Mazocarpon oedipternum forma Megalophorum 



Pig. 1. Photograph showing connection between the cellular "ramentum" 

 (R) on concave proximal surface of megaspore and the intra- 

 sporangial tissue: From C. B. 136 (18). 



2. Nearly radial thin-section through cone. Compare with text fig. 5b: 

 From C. B. 136 (24). 



3. Section across distal end of more or less fragmented sporangium, 

 transecting the apical prominence of the most distal megaspore. A 

 greater thickness of the sporangial keel (SpK) is cut in this plane. 

 The tissue of the keel is well shown: From C. B. 136 (34). 



4. Transverse section of sporophyll (tangential to cone axis) taken 

 near the proximal end of the sporangium. Thin areas (T) in the 

 prismatic outer layer of the sporangium may be seen. Central 

 tissue is well shown; cells are much larger than those in the 

 sporangial keel (compare with fig. 3): Prom C. B. 136 (20). 



5a, b, c. Megaspores of Mazocarpon oedipternwrn [corresponding to 

 Triletes reinscM (pars.)] isolated by solution of calcite coal-ball 

 matrix. In some areas "ramentum" has scaled off. Spore photos by 

 E. A. Piatt. 



[45 



