130 



same author, published about a year later,* and "Plant Physif^l- 

 ogy and Ecology," 1907.) 



Although our friends the foresters cannot claim the science of 

 plant sociology as exclusively their own, they certainly deserve 

 much credit for the part they have played in developing it. Their 

 practice of measuring timber and estimating the annual growth 

 ought to be extended to other kinds of vegetation. One finfls 

 scarcely a hint of volumetric studies of vegetation in non- 

 economic botanical literature, but a few years from now perhaps 

 no description of natural vegetation will be regarded as complete 

 unless it contains an estimate of the volume or weight of vegeta- 

 tion per acre (or other unit area) and the absolute or relative 

 amount of new growth each year.f The annual increment, or 

 birth and death rate, of vegetation, although by no means easy 

 to determine in a mixed forest, ought to bear a fairly definite 

 relation to the sum of all environmental factors, just as crop 

 yields do, and it would be extremely interesting to know whether 

 or not it increases with the progress of succession, for instance. 

 College Point, N. Y. 



THE ADMIRABLE POPYPORUS IN THE FLOR.A OF 

 THE LAKE GEORGE REGION 



By Stewart H. Burxham 



The first specimen of Polyporus admirabilis Pk., recorded Ln the 

 Flora, was found by Mrs. R. B. Van Alstyne, of Troy, at Lake 

 George, in 1900, on an apple tree.| Dr. Chas. H. Peck after- 

 wards found it in the flora, July 25, 1906, at Friends Lake, 

 Warren county, on an apple tree, which is recorded in his un- 

 published notes. I have never found it in the Lake George 

 Region growing on apple trees. 



The specimens of Polyporus odmirabilis, which I have found 



* For references to reviews of these two books see Ann. X. Y. Acad. Sci. 17: 349- 

 Nov. 1906. Other good reviews, published too late to be cited there, are those by 

 Blackman and Tansley in the New Phytologist, Nov. and Dec. 1905, and by Fernow 

 in the Forestry Quarterly, Alarch, 1906. 



t For some data of this kind for herbaceous vegetation in the Great Plains 

 region see Shantz, U. S. Dept. Agr. Bur. PI. Ind. Bull. 201: 81. 1911. 



t N. Y. State Mus. Rept. 54: 154. 1901. 



