1895.] Botany. 747 
BOTANY: 
Decades of North American Lichens.—Botanists have lately 
received the 16th, 17th and 18th decades of this interesting distribu- 
tion by Clara E. Cummings, T. A Williams and A. B. Seymour. An 
examination of the specimens shows them to be most satisfactory. The 
species included are the following: 151. Ramalina levigata Fr. 
(Tex.) ; 152. R. pollinarella Nyl. (So. Dak.); 153. Evernia vulpina 
(L.) Ach. (Calif); 154. Theloschistes villosa (Ach.) Wainio, (L. 
Calif.) ; 155. Parmelia borreri Turn. (So. Dak.) ; 156. Umbilicaria hy- 
perborea Hoffm. (N. H.); 157. U. phæa Tuck. (Calif.) ; 158. Sticta 
aurata (Sm.) Ach. (So. Car.); 159. S. anthraspis Ach. (Calif.) ; 160. 
Peltigera aphthosa (L.) Hoffm. (Me.); 161. Pannaria lanuginosa 
(Ach.) Koerb. (Iowa); 162. Collema pulposum (Bernh.) Nyl. (Iowa); 
163. Leptogium pulchellum (Ach.) Nyl. (Iowa); 164. Placodium muro- 
rum (Hoffm.) DC., (Mass.); 165a. P. cerinum (Hedw.) Naeg. & Hepp. 
(Ohio); 165b. P. cerinum (Hedw.) Naeg. & Hepp. (Iowa); 166. Le- 
canora muralis (Schreb) Schaer., a. saxicola Schaer. (Iowa); 167. Le- 
canora varia (Ehrh.) Nyl. d. symmicta Ach. (Me.) ; 168. Rinodina ore- 
ina (Ach.) Mass. (So. Dak.); 169. R. sophodes (Ach.) Nyl., e. exigua 
Fr. (So. Dak.); 170. Pertusaria velata (Turn.) Nyl. (Iowa); 171. 
Biatora suffusa Fr. (Iowa); 172. Buellia oidalea Tuck. (Calif.) ; 173. 
Opegrapha varia (Pers.) Fr. (So. Dak.); 174. Graphis afzelii Ach. 
(La.); 175. G. scripta (L.) Ach., var. serpentaria Ach. (So. Dak.) ; 
176. Arthonia dispersa (Schrad.) Nyl. (Nebr.); 177a. A. lecideella 
Nyl. (Mass.) ; 177b. A. lecideella Nyl. (Iowa); 178. A. radiata (Pers.) 
Th. Fr. (Iowa); 179. Calicium quercinum Pers. (Ohio); 180. Pyrenula 
subprostans (Nyl.) Tuck. (No. Car.). 
CHARLES E. Bessey. 
North American species of Polyg m.—Mr. John K. Small 
has done a good work in bringing out his monograph of this interest- 
ing genus, which is issued as one of the Memoirs from the Department 
of Botany of Columbia College. All told there are according to this 
paper, seventy species, and in discussing these, the synonymy is fully 
and carefully worked out. The descriptions are full, and leave little 
to be desired. The omission of all reference to type specimens, and 
specimens examined from different localities and herbaria is to be 
1 Edited by Prof. C. E. Bessey, University of Nebraska, Lincoln, Nebraska. 
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