176 MEMOIRS. OF THE NEW YORK BOTANICAL GARDEN [VOL. 10 



rounding' vascular elements but not separating xylem from phloem. The pres- 

 ence of carbonized resin deposits, among' both parenchyma and sclerenchyma 

 cells, was noted in bracts of several species of Stenopadus. 



Stomatochaeta (fig. 37) possesses bract structure similar to that of the inner 

 bracts of Stenopadus eucullatus. As demonstrated by the bract of Stomatocluu ta 

 cylindrica shown in figure 37, however, a marked difference occurs between the 

 the large-celled sclerenchyma on the outer face of the bract and the much 

 smaller sclereids on the inner face. Inner bracts of Stomatochaeta are similar, 

 except that sclereids on the outer face of the bract grade into the thin-walled 



Figs. 35-39. Portions of transections of involucral bracts, adaxial face above. Fig. 35. 

 Stenopadus campestris, Maguire 35573 ; inner bract. Fig. 36. Chimantaea similis, Steyermurk 

 Sr Wurdack 605 ; inner bract. Fig. 37. Stomatochaeta cylindrica, Maguire 32782; outer bract. 

 Fig. 38. Stenopadus cucullatus, Maguire 35120; inner bract. Fig. 39. Quelchia cardonae, 

 Steyermark 4' Wurdack 565 ; inner bract. 



