GLOEOSPORIUM. 485 



Several fimgi of very ne.ar relationship, if not actually identical, 

 occur on Platanus} All cause considerable disfiguration of the 

 foliage, so that a systematic destruction of all young diseased 

 branches is strongly recommended. 



Gl. cingulatum Atks.- This is the cause of Anthracnose on 

 Privet {Ligastrum vidgarc) in the United States. The following 

 is Atkinson's diagnosis: "Affected areas light brown, either 

 oblong on one side of the stem or completely girding it. Acer- 

 vuli 100 to 150 in diameter, rupturing the epidermis, in age 

 black from the dark stroma lying in the base or extending 

 irregularly up the sides, frequently forming a pseudopycnidium. 

 pjasidia numerous, crowded, simple, hyaline, or when very old 

 perhaps faintly fuliginous. Spores oblong, or elliptical, straight 

 or little curved, usually pointed at the base. From jiustules 

 on the stem they measure 10-20 by 5-7; in artificial cultures 

 they are frequently much larger, but when crowded in the media, 

 or when the nutrient sultstances are nearly exhausted, they may 

 be considerably smaller. ( )n stems of Ligastrum vulyarc. 



" Tiiis is quite distinct from Crloeosporium lujustriiium Sacc." 



Many species of Glocosporium frequent Ijroad-leaved trees 

 and cause more or less injury to the foliage. 



Gl. rhododendri Br. et Cav, attacks the leaves of outdoor 

 cultivatetl rhododendrons in autumn, or indoor species in 

 winter. Large yellow spots marked with concentric zones 

 are formed, and bear the pycnidia ; finally the leaves dry up 

 and fall off. 



Gl. violae W. et Br. attacks violets in lUitain and U.S. 

 America. 



Gl. vanillae C"ke. et ^lass. (Caluspora ranilho' Massee."^) 

 This causes a dangerous disease on VaiiiUd ijlanifvlia and other 

 Orchideae in Mauritius and other parts of the tropics. Death 

 is brought about by the Gloeosjiorium (Hainsca) form of the 

 fungus, the higher reproductive organs only appearing when the 

 leaves are killed. 



Other species are known, but their economic importance is not 

 great. 



^ V. Tavel, Botun. Zi.itiuni, 1SS6; Leelerc dii Saldon, Renin qtn. de. Bodtnirpte, 

 1892. 



-Atkinson, "A Xew Anthracnose of tlie Privet,"' Cornell Unir. Ar/rir. Exper. 

 Station Bulletin, No. 49, LS92. 



•^Massee, Keio Bulletin, ls9-2, p. 111. 



