53 



habit of the fungi and the form and size of their spores separate them 

 from each other. Common in Tokyo in May on Rhododendron indicum. 



IV. Exobasidium hemisphaericum (n. sp.). (Figs. 12—17). 



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Gall-like swelling fleshy, compact outside and spongy inside, of a 

 snow white color, at first pyriform, globular above and narrowed at 

 the base, afterward expanded in diameter and forming a hemispherical 

 body, 3 c m or more in diameter. Hymenium subcuticular, extended 

 almost to the base of the swelling. Spores 4 to each basidium, 

 cylindrical, straight, 15 — 19 f± long, 4.5 p. broad. 



This is found on the lower surface of the leaf of Rhododendron 

 Metternichii S. et Z. and was first discovered by me in the summer of 

 1895, on the summit of Mount Odaihara in Yamato, at the height of 

 many thousand feet above the sea-level. This species resembles very 

 much Exobasidium 'discoideum Eliss, 1 and Exobasidium Rhododendri 

 Cramer, but may be distinguished from them by the color and form of 

 the swelling and especially by the form of the spores. 



V. Exobasidium pentasporium (n. sp.). (Figs. 18—19.) 



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Hymenium subepidermal, appearing on the lower surface of the 

 leaf, sometimes restricted to a small portion, sometimes extended to 

 the whole lamina. Spores 4—6 to each basidium, mostly 5, 14.4 p. 

 long, 4 fi broad, oblong-reniform. Mycelium perennial, producing a 

 " hexenbesen " of the diseased shoots of the last plant. 



The diseased portion of the leaf differs from the surrounding 

 healthy portion only in its paler color and in the increase of a few 

 cell-layers ; these characters together with the habit of producing " hexen- 

 besen " distinguishes this species from all other species 2 of the genus. 

 Common in Nikko in May and June on the branch of Rh. indicum Sw.; 

 this was first discovered by me in June, 1895, in Nikko. 



1 Saccardo, Sjlloge Fungorum, Vol. VI, P. 665. 



2 Saccardo, Sylloge Fungorum, Vol. IX, P. 244, XI, P. 130. 



