— II ■ — 
and to the irregularities in the surface of the bed the moss clings, its stems fre- 
quently becoming dry and exposed as the water falls away. Some of my collec- 
tion made at this time was more robust than that given in the description by 
Cardot, the stems running from 8-25 cm. long, the stem leaves 4.5-5. 4 X 1.2- 
1.6 mm., the branch leaves 3. 5-4. 2 X .85-1 mm. Those of the stems are gradu- 
ally pointed, acutish, entire; those of the branches similar, but some obscurely 
denticulate. 
In 1911 another station for it was found in a narrow gorge made in the lime- 
stone by a stream that enters "The Sag” at Sag Bridge, about 12 miles south- 
west of Chicago. "The Sag” is a depression or valley that marks the course 
•of one branch of the outlet of the Glacial Lake Chicago, when the waters of the 
upper lakes flowed southward through the valley of the Des Plaines and Illinois 
rivers. Sag Bridge is 10 miles northeast of Romeo. The little brook is com- 
monly dry in summer, or without running water, but the bed is generally moist 
from the presence of occasional pools and from the deep shade of its vertical sides 
and overhanging trees and bushes. The moss adheres to the stones in its bed, 
roughened by holes and shelves in the rock, made by the rapid current. It was 
intimately associated with Ociodiceras Julianum (Savi) Bridel., the two much 
intermixed in their growth. 1 Being a very slender form, the stems usually 4-8 
cm. long (the longest noted being but 13 cm.) with correspondingly smaller 
leaves that were more acute and generally denticulate at the point, I was in doubt 
about its identity with the moss at Romeo. Some specimens were, in conse- 
quence, sent to M. Cardot, who pronounced them a form of F. Umbachii, differ- 
ing mainly in the sharper and more denticulate leaves. Specimens were also 
sent to Rev. C. H. Demetrio, Emma, Missouri, to compare with F. Missourica. 
Examples of this and of F. filiformis Sull. & Lesq. were kindly forwarded to me 
by him, so that I could make comparisons. The form at Sag Bridge quite 
closely approaches F. Missourica in its slender stems (probably due in the main 
to rather starved conditions of growth), and in its more pointed, slightly den- 
ticulate leaves, but they are more canaliculate, becoming quite tubulose on the 
branches, so that at the tip they are long-pointed, some almost setaceous. 
Soon after I came upon the moss in a third station, while examining the 
plants of Long Run, a creek which once flowed directly into the Des Plaines a 
mile or two below Romeo, but now into the Illinois and Michigan Canal which 
cuts it off from the river. The station is about three miles above the mouth of 
the creek. The stream is perennial from this point down, being fed by numer- 
ous springs. Though the bed is in limestone farther down, here it is in the 
drift, but well supplied with gravel and large water-worn pebbles from the mo- 
rainic hills in close proximity, the mass of which is limestone or Joliet gravel. 
At the place where the moss was most abundant the pebbles were so numerous 
and heaped together as to form a little rapid. Here it clung to the stones in 
large wads. For a short distance below it adhered to those scattered in the 
deeper and more quiet waters. A careful search for a long distance below, 
1 In 1909 I found a similar close association of Ociodiceras with Foniinalis 'Novae- Angliae 
•Sulliv. in a woodland streamlet about a mile west of Saegerstown, Pa. 
