- - i.,' - l 
166 Wisconsin Academy of Sciences , Arts and Letters . 
Page 76, for last 10 lines, substitute: 
Leaves not falcate. 
Abruptly filiform apiculate, alar cells not conspicu¬ 
ous .H. tricliopiiorum, 100, 
Gradually filiform acuminate, alar cells orange. 
Plants slender, 2—3 cm. long. 
Branches erect, leaves serrate . . H. MuMenbeckii, 111. 
Branches intricate, leaves nearly entire . H. Fitzgeraldi, 112. 
Plants stout, 7—10 cm. long, leaves quite entire H. stellatiim, 131. 
Acute or short apiculate, alar cells few, large . II. palustre, 165, 
Obtuse, entire, alar cells hyaline . . . H. cuspidatnm, 176. 
Page 78, under II, in parenthesis, dele: 
and Bracliytliecium Tliedenii. 
The following typographical errors should also be corrected: 
Page 13, line 1, for nothing read noting. 
Page 15, line 10 from bottom, for 153 read 152. 
Page 22, line 4, for B * read 2 *. 
Page 53, line 20, for P. Muhlenbeekii read P. Mulilenbergii. 
Page 60, line 7 from bottom, for A. augustatum read A. angustatum* 
Page 69, line 16 from bottom, for H. abietiuum read If, abietiimm. 
