REPORT OF THE STATE BOTANIST I917 . Jl 



is not excluded. It is often possible to take a herbarium specimen, 

 wet it in water and dry it out again, and have it present quite a 

 different shade of color from the one it first possessed. 



The writer desires to make the following acknowledgments for 

 help of various kinds in the preparation of the paper : To Dr H. D. 

 House, the New York State Botanist, who on several occasions 

 has put Doctor Peck's Poria collection at the writer's disposal and 

 who through his generous concessions has made possible the present 

 form of the paper; to Prof. C. R. Orton, of State College, Pa., for 

 suggestions and criticisms of the manuscript; to E. T. Kirk, of 

 State College, Pa., for his painstaking and patient endeavors to 

 secure the best possible microphotographs from the sections sup- 

 plied; and to others who have aided in various ways. 



Poria attenuata (Peck) Cooke 



Plate 1, figures 1-6; plate 2, figures 1-2 



Grevillea, 14: no. 1886. 



Polyporus attenuatus Peck, Buffalo Soc. Nat. Sci. Bui. 1, p. 61. 

 1873. 26th Rep't N. Y. State Mus., p. 70. 1874. 



Original description. Resupinate, effused, very thin, separable 

 from the matrix, pinkish-ochre, the margin whitish; pores minute, 

 subrotund, with thin acute dissepiments. 



Prostrate trunks of deciduous trees. Croghan. September. 



The pores are scarcely visible to the naked eye. 



Notes. This is the first species of Poria described by Peck, and 

 the description is extremely meager. Fortunately, the species is 

 rather common in the eastern United States and its characters 

 easily recognized. The type collection is quite small, consisting of 

 only four small fragments less than 6 cm long and 2 cm broad. 

 One of these is reproduced in plate I, figure 7. These specimens 

 do not have the exact coloration typical of most collections seen 

 by the writer, but all are alike in microscopic structure. 



The plants are annual, thin, and separate rather easily from 

 the substratum. The color of the hymenial surface of the type 

 collection is near vinaceous buff or avellaneous. In other collec- 

 tions, however, the color is light pinkish cinnamon to light ochra- 

 ceous salmon. Sometimes darker colors, approaching cinnamon, are 

 met with. In one especially light-colored collection made by the 

 writer the hymenium when fresh was light buff or cream color. In 

 all cases the fructifications are surrounded, at least in part, by a 

 narrow, white, finely pubescent or nearly glabrous margin, less than 



