XVIII 



STAUROPTERIS 



29 



The appendages appear in alternating pairs right and left of the very 

 slightly bifacial upper region of the rachis. They branch again repeatedly, 

 and the appearance they collectively presented must have been that of 

 "a feathery plexus of delicate green branchlets devoid of lamina, some 



I'ig- 3-9- Stanropteris oldhaiina Ijinney. Transverse 

 section of a petiole. A, A, A, A, the four fundamental 

 poles; d, d, poles of protoxylem passing off. (Afier 

 P. Bertrand.) 



Fig. 330. Stauropleris oldhainia. Transverse section of vascular bundle of main 

 rachis, showing the cruciform xylem with protoxylem near the four angles. 

 Groups of large sieve-tubes are seen in the bays of the wood, and small-celled 

 phloem between wood and cortex, and in the middle, (x 60.) S. Coll. 2202. 

 (From Tansley, New Phylologist. After Scott.) 



