﻿Notes on the Japanese Fungi. 



IV. C/EOMA ON PRUNUS. 



BY 



S. Kusano. 



With Plates III and IV. 



n. sp. ( 



Sori epiphyllous, densely scattered, generally roundish on the marginal 

 and oblong on the median portion of the host, sometimes confluent, size 

 large, variable, sometimes attaining to 6 x 14 mm ; spores oval or elliptical, 

 epispore hyaline, finely verrucose, contents orange-yellow, size variable, 15- 

 25x20-42/^, generally 23x31^; hymenium dense with orange-yellowish 

 contents. 



Spermogonia amphigenous, crowded on the whole surface, but especial- 

 ly denser on the upper surface of the host. It forms finely granular 

 elevation of orange-yellowish colour with filiform or club-shaped tuft of 

 hyphas at the aperture. Spermatia roundish, hyaline. 



Hab.: — On Primus Mume S. et Z. The fungus attacks the bud, and 

 causes hypertrophy and distortion to the young shoot derived from it 

 (Fig. 1). When the flower-bud is affected the ordinary course of develop- 

 ment is perverted or changed, and it is subjected to a remarkable 

 chloranthy or allied liial formation (Figs. 2-4). 



Loc: — Yemura in Pro v. Bitchu (Z. Sho, June 1901), Kobotoke in Prov. 

 Musashi (T. Makino, May 1902), Nagafusa near Mt. Takao in Prov. Mu- 

 sashi (S. Kusano, June 1902, May 1903), Botanic Garden at Komaba 

 (S. Kusano, May 1905), Nikko (S. Kusano, June 1904). 



The affected buds seem to open somewhat earlier than the normal. 

 As soon as shoots or flowers are derived from them the fungus begins to 

 form spermogonia whicli are wholly replaced afterwards by the sori of ae- 

 cidiospores (Figs. 3, 4), except on bracts, sepals and stipules of lower leaves 



(1) S. Kusano, On a Fungus Disease of Primus Mume. Bot. Mag., Tokyo. XVII. 1903. 

 [Japanese]. 



