THE AM ERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL 



Vol. XIV 



MAY, 1893. 



No. 



A Stiul.v of a New Funi^us. 



By GEO. F. ATKINSON, 



ITHACA, N. Y. 

 (with FRONTISPIKCE.) 



[Tlic girdling ;inthracnose, Glceosporiuvi cingiilatiitu^ is a 

 new species ot" riingus which has recently been described by 

 Prof. Geo. F. Atkinson in Bulletin No. 49 of the Cornell Uni- 

 versity Agricultural Experiment Station. It was found parasitic 

 upon the privet {Ligtistriim vulgar c). at Penn Van, N. Y., and 

 is quite similar to the "ripe rot " of apples ( G. fi-uctigenu7n.) 

 We extract the following paragraphs from his report, which 

 shows some excellent microscopical work, and we acknowledge 

 the kindness of the Station ofHccvs in loaning us the cuts. — Ed.] 

 Appearance of the Diseased Twigs. — From 12 to 18 

 inches or more of tlie terminal portion of some of the twigs was 



dead, the point where the dead 

 portion joined the healthy pre- 

 senting the depressed line ob- 

 servable on twigs of pear and 

 apple artected with the blight. 

 The resemblance to blight, how- 

 ever, was only superficial and 

 confined to twigs in the final 

 stage of the disease. Other 

 twigs presenting an apparently 

 healthy terminal portion were 

 fountl to be diseased at a point 

 about 12 to 18 inches from the 

 end, where a depressed area of 

 diseased tissue was observed, 

 oblong in outline, the longer di- 

 ameter being parallel with the 

 longitudinal axis of the stem. A 

 comparison of the diflerent spec- 

 imens showed that this diseased 

 area, cpiite small primarily, and 

 seated only upon one side of the 

 twig, gradually increased in size 

 until eventuallv it extended entirely around the twig, completely 



^P 



DISBASEI) TWIC; 



SKCTION r)H A PUSTULE. 



