MOSSES WITH A HAND-LENS 



183 



rows, outer ends (apices) folding inwards towards each other 

 when dry, nearly circular to oblong, plainly margined and margin 

 clearly to be seen with high power lens. Gemmae lacking. This 

 species is found in Massachusetts and southwards. 



O. DENUDATUM (Mart.) Dum. grows principally on rotten 

 wood or peaty banks throughout eastern North America. The 

 leaves are not margined and diminish in size towards both ends 

 of the stem or branch ; they are more concave than in the pre- 

 ceding, but take the same position when dry. Gemmiparous 

 branches with much diminished leaves are frequent. 



42 



FIGURE 114- (After Evans). Upper, under, and side view of stem 

 of Odontoscliisma prostratum and perichaetial bracts all X 18. 



