EXIDIA JAPONICA, FROM PROFESSOR A. YASUDA, 

 JAPAN (Figs. 845, 846 and 847). Gyrose, applanate. Color dark, 

 almost black. When moist (Fig. 845) 2-3 mm. thick. When dry 

 (Fig. 846), a thin, ridged membrane less than a mm. thick. Tissue 



Fig. 845. 



Exidia Japonica 



Fig. 846. 



hyaline with a few dark hyphae inter- 

 posed, which are dense, forming a thin, 

 dark surface layer. Surface densely 

 covered with fasciculate bundles of pro- 

 jecting hyphae (papillae) which when 

 moist are dark, but when dry are white. 

 Basidia 7-8 x 8-10, cruciate, imbedded 

 in the dark surface layer. Spores not 

 found. 



There are several species of Exidia 

 with similar structure, viz., the common 

 Exidia glandulosa, Exidia truncata and 

 Exidia spiculosa (in the sense of Tu- 

 lasne). The latter is not for me the same 

 as Exidia glandulosa, as usually re- 

 ferred. 



Exidia Japonica is close to Exidia 

 glandulosa. It is more firm, dries in 

 a thicker layer, the tissue is hyaline (colored in Exidia glandulosa), 

 and it is the only species known to me with white papillae when 

 dry. The papillae of other species are concolorous and are hardly 

 noticeable on dried specimens. The structure of Exidia spiculosa 

 was first correctly shown by Tulasne (1873). Our enlargement 

 (Fig. 847) will show the dense, white papillae on which the species 

 rests. 



599 



Fig. 847. 



