SAUL, WILLIAM EMMETT. 1955. A descrip- 

 tive catalogue of the trees and larger woody 

 shrubs of Utah based on the anatomy of the 

 wood. Ph.D. thesis. Univ. Utah, Salt Lake 

 City. 



Discusses anatomy of Engelmann spruce. 



SCHAEFFER, W. H. 1954. Harvesting technique 

 for beetle -killed Engelmann spruce on the 

 western slope of Colorado. Jour. Forestry 

 52: 860-862. 



SCHEFFER, T. C. , and G. G. HEDGCOCK. 

 1955. Injury to northwestern forest trees by 

 sulfur dioxide from smelters. U.S. Dept. 

 Agr. Tech. Bui. 1117, 49 pp. 



SCHENK, J. A. (See Clark and Schenk. 1962) 



SCHNEIDER, E. C. 1909. The distribution of 

 woody plants in the Pike's Peak region. Colo. 

 Col. Pub. 12: 137-170. 



Discusses distribution of Engelmann spruce. 



SCHOPMEYER, C. S. , and A. E. HELMERS. 

 1947. Seeding as a means of reforestation in 

 the northern Rocky Mountain region. U.S. 

 Dept. Agr. Cir. 772, 31 pp. 



SCHUBERT, G. H. 1954. Viability of various 

 coniferous seeds after cold storage. Jour. 

 Forestry 52: 446-447. 



SEAVER, F. J. , and P. F. SHOPE. 1930. Myco- 

 logical foray through the mountains of Colo- 

 rado, Wyoming, and South Dakota. Mycologia 

 22: 1-8. 



Discusses fungi noted on dead Engelmann 

 spruce . 



SEAVER, F. J. , and P. E. SHOPE. 1935. New 

 or noteworthy Basidiomycetes from the central 

 Rocky Mountain region. Mycologia 27: 642- 

 651. 



Describes several species found on dead 

 Engelmann spruce. 



SEAVER, F. J. , and P. F. SHOPE. 1936. Some 

 Rocky Mountain Basidiomycetes . Univ. Colo. 

 Studies 23(3): 189-197. 



Describes Basidiomycetes noted on dead 

 Engelmann spruce. 



SECOR, J. B. 1957. Soil characteristics in re- 

 lation to certain forest types in the northern 



Rockies. Dissert. Abs. 17: 735-736. 

 Idaho , 



SHAFER, JOHN ADOLPH. (See Britton and 

 Shafer. 1908) 



SHANTZ, H. L. , and R. ZON. 1924. Natural 

 vegetation. IN: U.S. Dept. Agr., Atlas of 

 American Agriculture, Part I, Sec. E. 



Discusses distribution of Engelmann spruce. 



SHARP, S. S. 1915. Notes on the determination 

 of Rocky Mountain conifers. Torreya 15: 1-8. 



SHAW, CHARLES GARDNER. 1958. Host 

 fungus index for the Pacific Northwest 1. 

 Hosts. Washington Agr. Expt. Sta. Cir. 335, 

 127 pp. 



Lists many fungus diseases of Engelmann 

 spruce . 



SHEARER, RAYMOND C. 1960. (See Supple- 

 ment, p. 37) 



SHELFORD.'V. E. (Ed.) 1926. Naturalist's 

 guide to the Americas. 761 pp. Baltimore: 

 Wilblams and Wilkins Company. 



Includes some ecological information on 

 Engelmann spruce and on distribution of the 

 species. 



SHEPHERD, R. F. 1959. Phytosociological and 

 environmental characteristics of outbreak 

 and non-outbreak areas of the two-year cycle 

 spruce budworm, Choristoneura fumiferana. 

 Ecology 40: 608-620~! 



SHIRLING, A. E. 1946. The age of needle 

 leaves. Kansas Acad. Sci. Trans. 49: lo 1 - 



166. 



SHOPE, PAUL F. 1940. Colorado rusts of 

 woody plants. Univ. Colo. Studies, Ser. D, 

 1(2): 105-127. 



Lists several species of rusts on Engelmann 

 spruce. 



SHOPE, PAUL F. 1943. Some ascomycetous 

 fouage diseases of Colorado conifers. Univ. 

 Colo. Studies, Ser. D, 2(1): 31-43. 



Two diseases are listed for Engelmann 

 spruce. 



SHOPE, PAUL F. (See Seaver and Shope, 1930; 

 1935; and 1936) 



SHREVE, F. (See Livingston and Shreve. 1921) 



29 



