PLANTS OF RHODE ISLAND. 69 
JUNGERMANNIA, L. 
1. Schraderi, Mart. On dead wood. 
2. barbata, Schreb. On earth and rocks. 
3. crenulata, Smith. On damp earth. 
4. pumila, With. On the ground and rotting logs. 
5, ventricosa, Dicks. On old logs. 
6. Helleriana, Nees. Upon rotten trunks. 
7. polita, Nees. Wet woody hillsides. 
8. incisa, Schrad. On the ground. 
SCAPANIA, Dmt. 
1. nemorosa, Nees. On damp earth. 
2. undulata, Nees. & Mont. In damp places. 
PLAGIOCHILA, Dmtr. 
1. porelloides, Lindbg. 
var. nodosa, (Taylor.) 
2. asplenioides, (N. & M.) On damp earth. 
To Hepatice, perhaps less attention has been given by American 
botanists, than to any order; it is certainly to be hoped that this 
neglect may not be a continuing quantity. 
No classification is yet quite satisfactory, and difficulties exist, 
which can only be overcome by careful and long continued inves- 
tigations. It would at first seem, that if Hepatice are related upon 
the one hand to Musci, and through Ricciacee upon the other 
hand to Lichenes, that a reversal of the above arrangement were 
called for, and that the thallophytic forms should be at the end of 
the series touching Lichenes, and cormophytic species should 
immediately follow Musci ; but to quote Prof. Underwood: 
‘** A lineal classification * * * * * does not properly present the 
‘‘natural position or inter-relations of the Hepatice and other 
‘‘groups, and indeed the affinities of the lower groups are too 
‘‘imperfectly understood to represent even a tolerable natural, that 
“is to say genetic relationship.”’ 
This remark will apply with force to the classification of all the 
crytogamic orders. 
