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, Dmtr. 



1. nemorosa, Nees. On damp earth. 



2. undulata, Nees. & Mont. In damp places. 



PLAGIOCHILA, Dmtr. 



1. porelloides, Lindbg. 



var. nodosa, (Taylor.) 



2. asplenioides, (N. cSc M.) On damp earth. 



To Hepaticoe, 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 Hepaticcn are related upon 

 the one hand to Muscl, and through Ricciaceoe upon the other 

 hand to Llchenes, that a reversal of the above arrangement were 

 called for, and that the thallophytlc 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 Hepaticoi and other 

 "groups, and indeed the affinities of the lower grouDs 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. 



