66 Wisconsin Academy of Sciences , Arts and Letters. 
Leaves serrate to subentire. 
Sharply serrate, teeth orange, spores about 11 fi . F. Wriglitii, 4„ 
Obscurely serrate, teeth brown, spores about 17 ju F. Ravenelii, 5. 
Obscurely serrate, teeth with prominent articulations on 
back.F. Donnellii, 6. 
THELXA, p. 298. 
Papillae of leaves simple. 
Horn shaped, curved.T. hirtella, 1. 
Globose.T. robusta, 3. 
Papillae 2—4-furcate. 
Usually bi-furcate, teeth 1:17—20 .... T„ asprella, 2. 
Usually 4-furcate, teeth 1:12.T. Lescurii, 4. 
MYURELLA, p. 300. 
Leaves serrulate, obtuse (rarely short apiculate) . . M. julacea, 1. 
Leaves serrulate, abruptly apiculate-acuminate . . M. apiculata, 2. 
Leaves spinulose-dentate, abruptly long acuminate . M. Carey ana, 8. 
LESKEA, p. 302. 
I. Costa reaching to or beyond the middle. 
Percurrent. L. nervosa, 3. 
jNot percurrent. 
Leaves entire. 
Endostome divided into segments. 
Cleft between articulations, leaves bluntish . . L. obscura, 2. 
Not cleft, leaves acute.L. polycarpa, 1. 
Endostome a short undivided membrane . . . L. Austini, 6. 
Leaves crenulate.L. tristis, 5. 
II. Costa very short or none. 
Leaf cells linear-oblong.L. denticulata, 4„ 
Leaf cells rhombic. 
Leaves o p . primary stems acute ..... L. pulvinata, 7. 
Leaves of primary stems long acuminate L. Wollei, 8. 
Leaf cells round oval ....... L. nigrescens b 
AUOMODON, p. 304. 
Leaves not papillose.A. Toccose, 6, 
1 Kindberg: Ottawa Nat. ii (1889), 155, and Bull. Torr. Bot. Chib xvi (1889), 97. 
