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30. Hartig, PvObt. Wichtige Krankheiten der Waldbiiume, pp. 1-127, pis. 1-6, 1874. 

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32. Die Zersetzungserscheinungen des Holzes der Nabelholzbaume und der 



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34. Lehrbuch der Pnanzenkrankheiten, pp. 1-324, 1900, 3d ed. 



35. Text-book of the diseases of trees. Translated by William Somerville 



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36. Haselhoff, E., and Lindau, G. Die Beschiidigung der Vegetation durch 



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37. Haywood, J. K. Injury to vegetation by smelter fumes. Bur. Chem., U. S. 



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38. Heald, F. D. A disease of the cottonwood due to Elfvingia megaloma. Nebr. 



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39. Hedgcock, G. G. Studies upon some chromogenic fungi which discolor wood. 



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40. Hennings, P. Ueber die in Gebauden auftretenden wichtigsten holzbewohnen- 



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41. Ueber die an Biiumen wachsenden heimischen Agaricineen. Hed- 

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42. Hopkins, A. D. Bur. Ent., U. S. Dept. Agr., Buls. 21, 28, 32, 37, 48, 56, 58; 



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 1903, pp. 313-328; 1904, pp. 381-398; 1905, pp. 249-256. 



43. Catalogue of West Virginia forest and shade tree insects. W. Va. Agr. 



Expt. Sta., Bui. 32:171-251, 1893. 



44. Howard, Albert. Suggestions for the removal of epiphytes from cacao and lime 



trees. W. Indian Bui. 3:189-197, 1902. 



45. Klebahn, H. Jahrb. f. Wiss. Bot., 41:485-560, 1905. 



46. Lamson-Scribner, F. Leaf-spot disease of catalpa. U. S. Com. Agr., Rept. for 



1887, pp. 364-366, 1888. 



47. Lightfoot, J. Flora Scotica, 2:1034, 1777. 



48. Lindroth, J. I. Beitrage zur Kentniss der Zersetzungserscheinungen des Bir- 



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49. Lintner, J. A. Injurious and other insects of the State of New York, 1:1-381, 



1882; 2:1-265, 1885; 3:83-154, 1887; 4:1-237, 1888; 5:147-347, 1889; 6:100-203, 

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50. Lloyd, C. G. Mycological notes, 135:60, 1901. 



51. MacMillan, H. R. Private letter containing considerable information concerning 



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52. Mayr, H. Ueber den Parasitismus von Nectria cinnabarina. Inaug. Dissert., pp. 



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53. Zwei Parasiten der Birke, Polyporus betulinus, Bull., und Polyporus 



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149 



