FOSSIL PLANTS. 449 



SYRINGODENDRON CYCLOSTIGMA, Brgt. 



Hist. Vcg. Foss, p. 480, Tl. 160, fig. 2 and 3. 

 Found at Alton, by Mr. H. A. Green. 



GENUS SIGILLARIOIDES, Lesqx. 



CYLINDRICAL roots or stems ? variable in size, marked on the 

 surface either by round scars, without trace of a central vascu- 

 lar point, placed in a regular quincunxial or spiral order, or 

 by defined Sigillarioid cicatrices with a central vascular point, 

 without any regular order of position in relation to each other. 

 To this genus are referable the remains of what I consider as 

 roots of Sicjillaria. 



SIGILLARIOIDES RADICANS, Sp. nov. 



PI. xxxi, fig. 4. 



PRIMARY axis cylindrical, about one inch broad, irregularly 

 inflated and strangulated towards the narrower^base, bearing 

 long tubular rootlets or leaves attached to rhomboidal cica- 

 trices, which are narrowed on both acute sides, and marked in 

 the middle by a broad vascular point; leaves or rootlets more 

 than one line broad, marked in the middle by a vascular line 

 or medial nerve. The scars are tolerably distant, and without 

 any regularity of position relatively to each other. Though 

 slightly variable in their form, they are so remarkably similar 

 to those of Sigillaria monostigma, that the intimate relation 

 of these remains cannot well be doubted. This specimen is 

 interesting, especially as seemingly indicating a similarity of 

 scars between some species of trees of the Coal Measures and 

 their roots. 



Mazon creek ; in clay iron-stone nodules. 



57 



