28 



Mycologia 



Gloeosporium citricolum Hori in Kwaju (Fruit Tree) no. 123: 

 21. June, 1913 ; in Engei no Tomo (Friend of Horticulture ) 

 9 7 : 627. Jul. 1913; in S. Hori's Shokubutsu Byogai Kowa 

 (Lectures on plant diseases) 2: 113-114. Nov. 1916. not 

 Massee. 



Acervuli plentifully formed on upper surface of fallen leaves, 

 also appearing in less amount on lower surface, scattered or 

 more or less loosely gregarious, first subepidermal, later erumpent 

 and raised, light reddish-brown, about 120^ in diam., also occur- 

 ring on young twigs and on fruits ; conidiophores densely fascicu- 

 late, cylindric, subacutely tapering toward the apex, 2-3-septate, 

 branching, hyaline, 36-48 X 4-5 terminated by conidia ; conidia 

 cylindric, not curved, rounded at the apex, bluntly pointed at 

 the base, hyaline, sparingly nucleate, 14-20 X 4-6 germinating 

 from either end. 



On Citrus spp. particularly on Navel orange, Satsuma {Citrus 

 nobilis var. Unshiu), and Natsu-daidai (Japanese summer orange 

 resembling grape-fruit). 



Localities : Prefectures Wakayama, Hiroshima ; Islands Kyu- 

 shu, Taiwan. 



Spots first appear on leaves in spring and summer as cloud- 

 like irregular patches of somewhat dark color, which are in- 

 definitely margined from the healthy part. Such leaves soon 

 lose their vigor and defoliation immediately follows. Minute 

 pinkish pustules then appear plentifully on the surface of fallen 

 leaves. New shoots and fresh tips of the twig are also attacked, 

 causing immediate change of color to yellowish-brown and finally 

 to black, resulting in the entire death of that portion. On fruit, 

 brownish spots are commonly met with, which soon develop 

 pinkish pustules on the surface as in the case of the leaf. 



Illustrations : 1 photograph (halftone) of badly damaged Sat- 

 suma plant at Wakayama prefecture ( in 191 1 ) , and 1 woodcut show- 

 ing a diseased leaf, conidiospores and conidia (both in Nishida I.e.). 



Notes : In above cited literature Hori insists on the similarity 

 of this fungus to Gloeosporium citricolum Massee, though it 

 seems rather distinct in having branched conidiophores. Hemmi 

 recently pointed out the parasitic nature of this fungus in Sap- 

 poro Norin Gakkwaiho (Journ. Soc. Agric. & Forestry, Sap- 



