140 
B. Muriel Bristol. 
If a small tuft of protonema is transferred with its attached 
soil to a glass slide, and the soil is then very carefully broken up 
and removed by means of needles, it is possible to isolate the 
resting-cells from which the green protonema is produced. These 
resting-cells are not spores, but evidently constitute a resting 
filament of a moss protonema which was growing when the soil was 
Fio. 2. Distorted resting filaments showing attached vegetative filaments. 
a, cluster of dwarf branches; b, attachment of lateral branch ; c, swollen base 
of vegetative filament ; d, cell filled with oil globules, x ISO diameters. 
