184 Cheney and Trite — Flora .; of Madison and Vicinity. 
Preissia, Nees. 
888 . P. commutata , Nees. 
On overhanging rocks about Lake Mendota. 
Conocephalus, Neck. 
889. C. conicus , Dumont. 
Very abundant on the faces of cliffs about the-- 
lakes, near the water, and not rare on the ground 
in wet places. Rare in fruit. 
Asterella, Beauv. 
890. A. hemisphcerica , Beauv. 
On overhanging rocks about Lake Mendota. 
Grimaldia, Raddi. 
891. G. barbifrons , Bisch. 
On the ground on dry, gravelly hillsides. Wingra- 
Lake; ridge and hills near quarry two miles south 
of Madison. 
Ricciaceas. 
Riccia, Micheli. 
892. 
R. 
arvensis , Aust. 
- 
Growing on ground in cultivated field. 
Common. 
893. 
R. 
fluitans , L. 
In springs about the lakes. Local. 
894. 
R. 
natans , L. 
In the quiet parts of the lakes and 
throughout the region. 
in ponds 
