1£bm.mi : On a DisRASi; ot'" some I,ec;uminous 1'iani's caused by Ceratophora-n sctosiim Kirchner i m 



leaflets. The oUl spots arc brown or dark brown and sometimes chestnut-brown 

 on IJic upper svnface of the leaves, and very much li^liter on the mider side. Al- 

 though the spots are not bordered with a special color, they are on the upper sur- 

 face sharply sei)arate(.l from the green healthy part of the leaf, while on the under 

 surface their margin is not distinct. The large circular spots show sometimes 

 many concentric rings of the dark colored lines on the upjier surface. Tlie diseased 

 leaflets die early and soon dr)^ up in the summer or in the early autumn. 



4. Morphology of the Causal Fungus 



The m\'celium of the fungus is composed of slender, liyaline, septate hyphae 

 which grow mostly between the cells of the host. Some of the hyphae, appearing 

 on the upper side of the leaves, creep on the siu'face of the diseased spots. A 

 section through the diseased spot shows tlic hyphae to be ramifying in the tissue 

 of the leaf, and the chloroplastids dest:o\-cd. The mycelii.nn within the tissue or 

 on the surface varies greatly in diameter. Many of the lateral branches are very 

 slender, while the older hyphae may become greatly swollen. The hyphae found 

 in the tissue are hyaline, many septated, 2-10 //. in tliameter. The creeping hyphae 

 on the surface are generali)' jjoorly developed and are also hj'aline. In cultures, 

 the mycelium is at first colorless, then gradually turning into light brown or 

 bro'.vnish gray in color when seen under a microscope ; and it develops largely in 

 substratum, where it forms many intercalary knots of chlamydospores presenting 

 an ap[:)earancc of black dots in the media to the naked eye. 



Conidiophores are short and straight and are formed here ant! there 011 the 

 creeping hyphae on the surface of the leaf. They are generali)' simple, but rarely 

 branched. They are not easilj' distinguished from the normal hyphae in their 

 appearance. The spores are at first produced as the hyaline, club-shaped swell- 

 ings at the tifis of tlie conidio[jhores. Afterward a septum is formed at the base 

 of each swelling. In the course of development, they produce 4 or 5 rarely 6 

 transverse septa, and 3 or 4 sometimes more setae from the uppermost cell. At 

 the same time, the sjjores tmn gradually into brown or dark brown color. The 

 matured spores are very much like to those of Pestalozzia in tlieir morphological 

 characters. They are cylindro-fusiform in shape and mostl)' more or less curved. 

 The middle one or two cells of the spore are darkest, while the basal and terminal 

 end cells are general!)' very light in color or sometimes nearly hyaline. Accord- 



