April, 1906.] Corrections, Key to Liverworts. 503 



and the annuals: 



Anvchia dichotoma Michx. Oxalis stricta L. 



Anychia Canadensis (L.) 



The appearance of solitary specimens of such plants as Hi- 

 coria microcarpa, Vitis vulpina, Carpinus Caroliniana and Frax- 

 inus Americana in this thicket, probably indicates a return to a 

 mesophvtic stage. This will never fully develop however, until 

 the slope of the bluff has become such that sufficient humus can 

 accumulate for the support of this type of vegetation. 



Washington, D. C. 



CORRECTIONS TO THE KEY TO LIVERWORTS. 



Edo Claassen. 



The Key to Liverworts in the Ohio Naturalist Vol. V, 

 No. 6, should be changed in items 21-25 inclusive, as follows: 



2L Leaves bilobed and bidentate or emarginate and short-bi dentate. 22. 

 Leaves entire (sometimes retuse). 23. 



22. Leaves bilobed and bidentate; underleaves bidentate; perianth free. 



. Lophocolea. 

 Leaves emarginate and short-bidentate: underleaves entire; peri- 

 anth connate with the calyptra. Harpauthus. 



23. Underleaves often wanting or entire or nearly so. 24. 

 Underleaves 2-J:-parted. Chiloscyphus. 



24. Underleaves subulate, fugacious. Jungermannia. 

 Underleaves lance-subulate, entire and subdentate or wanting 



(except on gemmiferous shoots), broadly oval, entire and 

 subdenticulate. 25. 



25. Underleaves lance-subulate, entire and subdentate. Involucral 



leaves 2, connate at base, entire. Leaf-cells roundish, 5-7- 

 angular, cell walls much thickened, each cell appearing as if 

 surrounded by about 6 smaller, 3 or more angular ones. Stem 

 withovit runners. Mylia. 



Underleaves wanting (except on gemmiferous shoots), broady oval, 

 entire or subdenticulate. Involucral leaves 3-ranked, bifid or 

 bilobed. Leaf cells round, surrounded by much thickened 

 cell walls. Stem with runners. Odontoschisma. 



In the second to last line of the Key the word "Sphaerocephalus" 

 should read "Sphaerocarpus." 



