— 79 — 
Fig. 2. A. Underside of perichaetial leaf, showing a row of rhizoids- 
producing cells. 
B, C. D. Cross sections through the apex of the ordinary leaves, 
chlorophyll bearing cells marked X (After Correns). 
ASEXUAL REPRODUCTION OF LEUCOBRYUfl GLAUCUM. 
Charles C. Plitt. 
In the fall of 1907, and then in the early spring of 1908 I found a peculiar 
looking Leucobryum glaucum . There was no doubting the moss to be Z. 
glaucum, but the apical portion of nearly all the specimens of the patch 
seemed to be attacked by a fungus. Being more particularly interested in the 
lichens, I thought at first that I possibly had made some interesting and per- 
haps rare find in lichen study. Expecting to find some apothecia among 
the many fungus masses, I examined them most carefully with a hand lens, 
but none were found, nor any likewise later when looked at under the micro- 
scope. A sample of the first specimen was sent to Mrs. Smith and the 
remaining portion laid aside for the time being. 
Some time later, Mrs. Smith wrote the following and referred me to Cor- 
rens:* . . . “It is not attacked by a fungus as you queried, but it is the regu- 
lar asexual propagation, which is more or less common though this is the 
first time I have seen it.” . . . Examining this apparently “ fungus” growth 
with a microscope, one gets the impression that one was looking at a tangled 
mass of root hairs. Braithwaite, according to Dr. Grout, f states that this 
species (Z. g laucum) often produces on the upper leaves of the female plants 
minute tufts of “radicular tomentum” with young plants which fall off and 
serve to reproduce the plant which produces spores rather infrequently. 
* Untersuchungen iiber die Vermehrung der Laubmoose durch Brutorgane und 
Stecklinge, by Dr. Carl Correns. 
t Mosses with Hand-lens and Microscope, p. 109, and Mosses with a Hand-lens p. 50. 
