April, 1906.] 
Corrections, Key to Liverworts. 
503 
and the annuals: 
Anychia dichotoma Michx. Oxalis stricta L. 
Anychia Canadensis (L.) 
The appearance of solitary specimens of such plants as Hi- 
coria niicrocarpa, Vitis vulpina, Carpinus Caroliniana and Frax- 
inus Americana in this thicket, probably indicates a return to a 
mesophytic 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 C'l.\.\ssen. 
The Key to Liverworts in the Ohio Naturalist Vol. V, 
No. 6, should be changed in items 21-25 inclusive, as follows: 
21. Leaves bilobed and bidentate or emarginate and short-bidentate. 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. Harpanihus. 
23. Underleaves often wanting or entire or nearly so. 24. 
Underleaves 2-4-parted. Chiloscyphiis. 
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 
without runners. Mylia. 
Underleaves wanting (except on gemmiferous shoots), broady oval, 
entire or subdenticulate. Involucral leaves 3-ranked, bifid or 
bilobed. Leaf cells round, surrounded b}' much thickened 
cell walls. Stem with runners. Odontoschisma. 
In the second to last line of the Key the word “Sphaerocephalus” 
should read “Sphaerocarpus.” 
