PLATE 6. — Penduncle and Vascular Structure of 

 Mazocarpon oedipternum 



Fig. 1. Transverse section of peduncular stele with isolated tracheid 

 groups in medullary area: Prom C. B. 136 A. 



2. Transversa section of peduncle showing bract bases (with large 

 parichnoldal cavities) in spiral arrangement. Inner cortex not 

 preserved: From C. B. 195 D (Tl). 



3. Transverse section of stele in cone axis essentially lacking pro- 

 senchymatous medulla. Stele is slightly larger than those shown 

 in figs. 4 and 10 (compare magnification scales): From C. B. 139. 



4. Transverse section of stele in cone axis showing relatively large 

 thickness of metaxylem and small medullary area with scattered 

 central tracheids: From C. B. 130 B. 



5. Extreme tangential section of stele showing spiral elements in 

 sporophyll trace and on the outside of the adjacent stele. A few 

 scalariform elements also are entering the trace: From C. B. 

 136 (18). 



6. Longitudinal section of stele in megasporangiate cone axis show- 

 ing prosenchymatous medullary cells, scalariform metaxylem, and 

 annular and spiral protoxylem tracheids: From C. B. 136 (21). 



7. Horizontal portion of trace from sporophyll pedicel consisting 

 chiefly of scalariform tracheids: From C. B. 136 (18). 



8. Sporophyll trace ascending from the stele in cone axis showing 

 spiral, annular, and scalariform tracheids: From C. B. 136 (18). 



9. Longitudinal section of stele also shown in fig. 10 (cf, also plate 5, 

 fig. 1) showing annular medullary tracheids, scalariform metaxylem 

 tracheids and outgoing sporophyll traces: Ftom C. B. 124 E (T34). 



10. Transverse section of stele in cone axis (cf. plate 5, fig. 1) showing 

 verticillate arrangement of outgoing sporophyll traces. Isolated 

 medullary tracheids are present: From C. B. 124 E (T34). 



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