90 



Mycologia 



Mycelial strands (pilea) epigenous on trunks and twigs, first 

 circular then increasing the area irregularly, often attaining 10 

 cm. diam., flat, lichenous, i mm. thick, surface velvety, brownish, 

 pale-purplish-brown, or dark-brown, with very narrow thin 

 margin grayish in color ; hyphae branching, amber-colored, septate, 

 thick-walled, granulate, in continuous row, 3-5 p across ; proto- 

 basidia not formed ; basidia consisting of free branched ends of 

 surface hyphae swollen and more or less club-shaped, first uni- 

 cellular, hyaline and very granulate but at maturity sub-fusoid, 

 2-4-septate, straight or curved, 49-65 X 8-9 fx, producing sterig- 

 mata on each cell; sterigmata apical in the terminal cell, lateral 

 in others, long, curved, comparatively large, 35-63 X 3.5-4 ; 

 sporidia terminal on each sterigma, hyaline, unicellular, long- 

 falcate, obtuse, 27-40 X 4-6 germinating to form hyphae. 



On trunks and twigs of Morns, Salix, Vitis, Juglans, Xan- 

 thoxylum, Prunus Mume, Prunus donarium, Primus salicina, 

 Prunus Armeniaca var. Ansu, Pyrus Malus, Pyrus sinensis, 

 Ribes Grossularia, Kerria japonica, Thea sinensis, Paulownia 

 tomentosa } Firmiana platanifolia, and Pittosp.orum undulatum. 



Distribution : Japan, very common. 



Most Japanese authorities who have described this species have 

 confounded it with Septobasidium pedicellatum (Schw.) Pat. but 

 the true S. pedicellatum was first discovered in Formosa by Mr. 

 Sawada (Bot. Mag., Tokyo, 26 310 : 307-311, Japanese) where 

 Helkobasidium Tanakae does not occur. Septobasidium pedicel- 

 latum seems to attack only the mulberry tree and differs in having 

 chestnut-brown hyphae 3.5 fx across, forming an ocher-brown 

 pileus (never purplish), and in the formation of strongly curved 

 basidia, 24-48 X 6-8.5 /*> which develop from spherical proto- 

 basidia. 



Note: For an account of the occurrence of Septobasidium pedi- 

 cellatum in Honshu (Main Island), we are indebted to Prof. A. 

 Yasuda, who reported it from K6dzuke-no-kuni (Prefecture 

 Gumma-ken) Setagun (Bot. Mag. Tokyo, 28 335 : 447, Nov. 1914. 

 Japanese). Hara later states that it occurs commonly in the 

 main island (Dainippon Sanshi Kwaiho, Journ. Seric. Assoc. 

 Japan, 25 296 : 713, Sept. 1916). It has also been collected by 

 Miyake at a place near Tokyo (Sangyo Shikenjo Hokoku I 5 : 333, 

 Dec. 1916), and recently T. Watanabe reports that it is S\ pedicel- 



