The Anatomy of the Stem of Macrozamia 
compared with that of other genera of 
Cycadeae K 
BY 
W. C. WORSDELL. 
With Plates XXVII and XXVIII. 
C OMPARATIVELY few investigations have hitherto been 
made into the minute anatomical structure of the stem 
of the Cycadeae ; and any thorough and full account of this 
structure has been almost exclusively confined to two or three 
genera, as Cycas , Encephalartos , and Stangeria. Hence the 
examination of the stem of Macrozamia , a genus hitherto 
apparently untouched, seemed to promise some interesting 
results. 
Historical Survey. 
One of the oldest references to the internal structure of 
Cycadean stems is the investigation by Brongniart 1 2 ; this 
work is consequently by no means free from erroneous inter- 
pretations. For example, the author entirely fails to recog- 
nize the presence of any phloem (‘liber’) in either of the two 
zones which he describes and figures in Cycas revoluta , 
1 From the Jodrell Laboratory, Royal Gardens, Kew. 
2 Recherches sur l’organisation des tiges des Cycadees, Ann. Sci. Nat. I, ser. 
XVI, 1829. 
[Annals of Botany, Vol. X. No. XL. December, 1896.] 
