Snell: A New Septobasidium on Pinus Strobus 59 



Massachusetts : 



Middleboro : WHS No. 507, August. 



Wareham : WHS No. 598, August. 

 New York : 



Lewis : WHS No. 604, coll. by Dr. L. H. Pennington, August. 

 On Pinus monticola. 

 Idaho : 



St. Joe National Forest: coll. by Dr. J. R. Weir. 

 Brown University, 

 Providence, R. I. 



Literature Cited 



1. Burt, E. A. The Thelephoraceae of North America. VII. Septobasidium. 



Ann. Mo. Bot. Gard. 3: 319-43- fig- 14. 1916. 



2. Petch, T. Note on the biology of the genus Septobasidium. Ann. Bot. 25 : 



843. 1911. 



3. . Fungi parasitic on scale insects. Trans. Brit. Myc. Soc. 19 20 , 7 : 



18-40. . 1 92 1. 



Explanation of Plates 

 Plate i i 



Septobasidium pinicola on bark of living Pinus strobus. Two fructifica- 

 tions are shown at the union of the branches with the trunk, where they often 

 occur. Two-thirds natural size. Photograph by the author. 



Plate 12 



Fig. 1. Lower surface of a young fructification of Septobasidium pinicola, 

 showing remains of scale insects. The two groups of large bodies at the upper 

 and lower right-hand corners of the fruit body are large ovoid or spheroid 

 chitinous shells, dark-brown in color. The other crater-like depressions, mostly 

 in the left half of the fruit-body, are white waxy cases enclosing scale insects 

 such as is shown in fig. 2, which was removed from the hollow marked by the 

 large dark spot in the center. X 10. 



Fig. 2. Scale insect removed from lower surface of fruit-body shown above, 

 showing hyaline mycelium within the body of the insect. X 143- 



Photomicrographs by the author. 



Plate 13 



Fig. 1. Discontinuous cross-section of portion of fruit-body of Septo- 

 basidium pinicola, showing relation to host tissue. 



Fig. 2. Paraphysis-like organs (young probasidia ?) in hymenium. 



Fig. 3. Probasidia, one of them dark-colored and thicker-walled. 



Fig. 4. Germinating probasidia showing stages in the formation of spore- 

 bearing organs. 



