FOSSIL PLANTS. 
455 
Stigmarioides linearis, Sp. 110V. 
PI. xxxi, fig. 2. 
A long, linear, cylindrical root, half an inch thick, slightly 
tapering downwards, obtuse at the base or broken, bearing 
narrow linear leaves or radicles one line broad, without medial 
nerve, leaving at their point of attachment small round cica¬ 
trices, placed without order and without visible central point. 
The rootlets or the first divisions of the root are also marked 
with round scars, fig. 2a, indicating a subdivision similar to 
that which is sometimes observable on leaves of Stigmaria . 
Found at Mazon creek, in concretions. 
Stigmarioides affinis, Sp. nov. 
PI. xxvii, fig. 9. 
This species, represented by two specimens, appears inter¬ 
mediate between S. tuberosus and the following. It has a 
short cylindrical base, divided like a root in branches, tending 
obliquely downwards and diminishing to a point. This part, 
about one inch long, is covered with horizontal, half an inch 
long linear narrow scales, or by their scars, in the form of 
sharply elevated points. From its slightly strangulated coi¬ 
tion, or top, it abruptly passes into a broad linear flat leaf or 
blade, marked on each side by two obsolete lines resembling 
nerves. Its surface is equally marked with distant points, 
basilar scars of scales, a few of which are still seen on its 
borders. These borders are straight, sharp, well defined, like 
those of a leaf of Lepiclodendron, and the surface is minutely 
and irregularly striate lengthwise. 
Found in the concretions of Mazon creek ; by Mr. Jos. Even. 
