228 



BOTANICAL GAZETTE 



SEPTEMBER 



regions are recognizable long before lignification occurs. In young 

 sections of the roots the metaxylem cells are recognizable early by 

 their increased size and lack of protoplasmic content. The xylem 

 is crescent-shaped, the protoxylem occurring at the ends and 

 bordering the larger arc of the crescent. The mature roots, 2 or 



Fig. 2. — L. reflexiim: transverse section through young stem tip showing several 

 protoxylem points alternating with phloem in stele; phloem extends toward center of 

 cylinder, alternating with unlignified metaxylem cells; there is a phloem island 

 entirely surrounded by unhgnified metaxylem cells; this arrangement when mature 

 is represented in fig. 5; X200. 



3 in a stem, are typical cortical roots (fig. i). The stem of Lyco- 

 podium reflexum is small, about i mm. or less in diameter, with a 

 very small stele, o . 2 mm. in diameter. 



In stating the results of the investigation of the steles of the 

 stem of L. reflexum I shall include simply a brief description of the 

 steles found in the stems of various ages, omitting the details of 

 the development of the types, Avhich were given in the former 

 article and do not seem to vary much in different species. 



