THE DIFFERENTIATION OF THE PLANT-BODY 33 
sclerenchyma round the periphery, and strands occur also 
in connection with the bundles. Sometimes these are con- 
nected by bands of sclerenchyma lying between them. In 
Fimbristylis (fig. 82, 7) there is a ring of sclerenchyma in 
the cortex and patches around the periphery, which in other 
cases are joined like those of the former type. In the stems 
Hig. 32.—DiaGkam sHowIne THE Curler DIsposITions OF THE SKELETAL 
Apparatus IN A STEM witH Five CoLtatTERAL BUNDLES (IN TRANSVERSE 
Sxcrion). 
(The sclerenchyma is black; the bast of the bundles is white ; 
the wood is dotted.) 
1, Type without accessory sclerenchyma; 2, Hquisetum; 3, Bambusa; 
4, Pennisetum; 65, Scirpus; 6, Erianthus; 7, Fimbristylis; 9, Typha; 
10, Juncus; 14, Cladium. (After Van Tieghem.) 
of Typha (fig. 82, 9) a band of sclerenchyma lies at the 
back of each bundle, and either a ring or some isolated 
strands may be found in the cortex. The stem of 
Juncus (fig. 82, 10) shows these two forms combined 
together. 
Still more complicated cases show sclerenchyma arising 
in all three regions, sometimes the bands being all imde- 
pendent, sometimes united in various ways. In Cladiwm 
Mariscus (fig. 82, 14) thoge of all the regions are united 
3 
