A NEW SPECIES OF MULBERRY FUNGUS. ^^01 



ii«)t lie uni on the üronnd. The internal .structure of these two 

 ]VM-ti(^ns is, however, essentially the same. 



In the merlullary stratum of the pileus which lies on the an^i'ud, 

 an iiumense number of minute algae, belonging to the genera Conferva 

 and Profococrus (PL. XXVII, Fig. Iß) are found in groups, very 

 much like the gonidia of Lichens. On the higher parts of the stems 

 and branches of old mulberry trees, are frequently found orbicular and 

 lirownish purple patches, from 1-10 cm. in diameter ; they are com- 

 monly called " Köyaku-byö " * of the mulberry tree. They resemble 

 very much in their structure the young ])ileus of the speciees of 

 Helicohafiidium in question, except that the hyphfe in the pileus of 

 the foriuer are more slender than those of the latter, being only 2-8 

 U. in diameter (PL. XXVII, Fig. 12). The sterigmata of the former 

 are also very minute; and I hv.\e not been able clearly to determine 

 their number on a basidinm (PL. XXA'II, Figs. 13, 14). Besides 

 the ordinary slender basidia. 3 u. in diameter, much thicker and 

 segmented basidium-like extremities of hyphîe bearing no sterigmata 

 are often seen in the hymeninm (IM.. XX VII, Fig. 15 h Whether 

 the orbicular patches just described simply represent a form of tlw 

 present species or not can only be determined after further investiga- 

 tion. But I venture to say that it is probably a poorly nourished 

 form of the latter. 



In conclusion, I wish to express my thanks to Prof. K. Yatabe 

 who has helped me throughout my work with valuable suggestions. 



* The Japanese word kaijaku means a medical plaster; byô, disease. 



