FOSSIL PLANTS. 
453 
small scars of rootlets, generally placed without symmetrical 
order, and without a central vascular point. 
The affinity of this genus with the former appears at first very close ; but we 
have here species, evidently roots, some of them rhizomas of ferns, marked by 
irregularly placed scars, which cannot be united to a genus which, even if it 
should represent a kind of roots, is far different in its essential characters, viz : 
the regularity of position and the form of the scars. The name of Rhizolites, 
P. Braun., a genus enumerated but not described by Unger, might be, there¬ 
fore, appropriate if, per contra, the species had not a near relation to those of 
the former genus, by the form of the cicatrices and of the leaves. 
All these species appear to have been of a soft substance, and without excep¬ 
tion, have been found preserved in nodules. 
Stigmarioides truncatgs, Sp. nov. 
PI. xx ix, fig. 4. 
A cylindrical root, about one inch in diameter, with a smooth 
surface, marked with small round cicatrices, without order of 
position. These cicatrices vary much in size, and are evidently 
scars, left at the base of short, horizontal, flat rootlets, scarce¬ 
ly one line broad, without mark of a vascular line. The vas¬ 
cular point is also absent in the middle of the scars, or marked 
by a mere cavity. 
This species resembles the one published in vol. ii of this Report, p. 448, 
pi. xxxix, fig. 9, under the name of Stigmaria Evenii ,, which has the surface 
undulately ribbed and broader scars, and is also referable to this new genus. 
Found at Mazon creek, in concretions of argillaceous iron ore. 
Stigmarioides tuberosus, Sp. nov. 
PI. xxix, fig. 5. 
I do not know any vegetable organ to which these peculiar 
remains could be compared. The specimen figured represents 
a nearly round or square oval tubercle, with a convex sur¬ 
face covered with small round points irregularly placed, re. 
sembling scars of hairs or scales. In its upper part it is 
