1 84 



MOSSES WITH \ HAND-LENS 



JAMSONIELLA. 



JAMSONIEI-I.A AUTUMNALiS (DC.) Steph. (Jungermaiima 

 Schradcri Mart.) is a common species often confused with 

 Odontoscltisiiia prostratiiin. It appears to be a plant of more 

 elevated and cooler regions than Odontoschisma, as I find it 

 abundantly in the hills of southern Vermont, but not a trace of it 

 near New York City. It most frequently 

 grows on decaying wood, but may be 

 found on soil, trunks of trees, etc. It is 

 sometimes plain green, but usually dark 

 green to brownish in the older portions. 

 The leaves are nearly circular to short- 

 oblong, not margined, with the ends re- 

 flexed when dry as shown in the figures. 

 Flagella and geramfe wanting. The per- 

 ianth is terminal on a leading branch, 

 which distinguishes it from all forms of 

 Odontoschisma when fertile. The posi- 

 tion of the leaves when dry easily dis- 

 tinguishes sterile specimens. 



FiGURi; 115. One 

 moist and two dry 

 branches of Jamsoniella 

 autumnalis X S. 



NARDIA. 



There are several species of this genus within our range, 

 but they are hardly to be made out with a lens except perhaps 



N. CEENULATA (Smith) Lindb. It 

 is a smaller plant than the other 

 round-leaved hepatics and grows on 

 soil throughout our range. Mounted 

 and examined with a high power lens 



JC' VJ J( fl^ ''' ^'" ^' ""''^ '-"^ recognized by the 



margin, made up of a single row of 

 V, ij - WA very large square cells as shown in 



the figures. The margin is more dis- 

 tinct than in Odontoschisma and after 

 Figure 116. Side and mounting shows much more clearly, 

 top view of a stem of Nardia In that genus the margin is made up 

 crenulata hy about 20, and of two or three rows of much less 

 strongly differentiated cells. 



portion of leaf X 100. 



