170 
IOWA ACADEMY OP SCIENCES. 
39. C.W. Sever, Cambridge, Mass. 1886. Contains descriptions 
of thirty- one common lichens. 
51. . On the Schwendener Theory of the con- 
stitution of Lichens. Am. Mo. Mic. Jour. 8 : 21-25. F 1887. 
52. . About Lichens, Pop. Sci. News 26: 50- 
52, 65-67. Ap, My 1892. (Illustrated Pigs. 17.) A popular 
article for beginners in the study of lichens. 
53. . A Key to the North American Species 
of Cladonia. Cambridge, Mass., 1893. A quarto blue-print. 
54. Schneider, A. A. Monograph of Lichens. Bull. Torr. 
Bot. Club 21 : 492-493. 24 N 1894. A review of J. M. Crombie’s 
British Lichens. 
55. . Contributions to Lichenology. Bull. > 
Torr. Bot. Club 21 : 532-534. 24 D 1894. A review of J. Reinke’s 
‘ ‘ Abhandlungen tiber Pletchen. ” 
56. . The Biological Status of Lichens. Bull. 
Torr. Bot. Club 22: 189-198. 15 My 1895. 
57. . Some special Polygenetic Adaptations 
in Lichens. Bull. Torr. Bot. Club 22: 498-500. 30 D 1895. 
58. Stirton, J. Lichens, British and foreign. Trans. 
Glasgow Soc. of Field Nature. 85-95. 1875. Mentions species 
from Montreal and Lake Superior. 
59 Stitzenberger, E. Be Lecanora subfusca ej usque formis 
Commentatio, Botanische Zeitung 26: 888-902. 25 D 1868. 
Mentions North American varieties. 
60 . Notes on western Lichens. Erythea 
3: 30-32. 1 P 1895. Lists thirty-five Lichens from Yellow- 
stone Park, Monterey & Sitka. 
61. Tuckerman, E. An enumeration of some Lichens 
of New England, with remarks Boston Jour. Nat. Hist. 
2 : 245-262. 1839. Gives forty-three species and varieties. 
62. . A further enumeration of some New 
England Licheues. Boston Jour. Nat. Hist. 3: 281-306. 18 H. 
Gives sixty-eight species and varieties. 
63. . Farther notices of some New England 
Lichenes. Boston Jour. Nat. Hist. 3: 438-448. 1841. Gives 
twenty-six species. 
64. . A further enumeration of some Alpine 
and other Lichenes of New England. Boston Jour. Bot. 
5 : 93-104. Ja 1845. Gi\res thirty-one species. 
65. . Lichenes Americani septentrionalis 
exsiccati. Fasc. I-VI. Cambridge and Boston. 1847-1854. 
