1 84 



MOSSES WITH A HAND-LENS 



JAMSONIELLA. 



JAMSONIELEA AUTUMNAUS (DC.) Steph. (Jungermannia 

 Schraderi Mart.) is a common species often confused with 

 Odontoscliisma prostratum. 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 gemmae wanting. The per- 

 ianth is terminal on a leading branch, 



which distinguishes it from all forms of 

 FIGURE 115- One . 



moist and two dry Odontoschisma when fertile. The posi- 

 branches of Jamsoniella tion of the leaves when dry easily dis- 

 autumnalis X 5- tingnishes sterile specimens. 



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. CRENULATA (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 

 it will at once be recognized by the 

 margin, made up of a single row of 



V6ry ^ arge S( l uare ce Hs 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 by about 20, and o f two or three rows of much less 

 strongly differentiated cells. 



portion of leaf X 100. 



