GLOEOSPORIUM. 485 



Several fungi of very near relationship, if not actually identical, 

 occur on Platamis} 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 (Ligustrum mdgare) 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. 

 Basidia 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 pustules 

 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 substances are nearly exhausted, they may 

 be considerably smaller. On stems of Ligiistrum vulgare. 



" This is quite distinct from Gloeosporium ligustrinum Sacc." 



Many species of Gloeosporium frequent broad-leaved trees 

 and cause more or less injury to the foliage. 



GI. rhododendri Br. et Cav. attacks the leaves of outdoor 

 cultivated 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. 



GI. violae B. et Br. attacks violets in Britain and U.S. 

 America. 



Gl. vanillae Cke. et Mass. {Calospora vanillae Massee.^) 

 This causes a dangerous disease on Vanilla planifolia and other 

 Orchideae in Mauritius and other parts of the tropics. Death 

 is brought about by the Gloeosporium (Hainsea) form of the 

 fungus, the higher reproductive organs only appearing when the 

 leaves are killed. 



Other species are known, but their economic impartance is not 

 great. 



^ V. Tavel, Botan. Zeitung, 1S86 ; Leolerc du Sablon, Revue gen. de, JBotanigwe, 

 1892. 



^Atkinson, "A New Anthracnose of the Privet,'' ComeU Univ. Agric. Exper. 

 Station Bulletin, No. 49, 1892. 



^Massee, Kevi Bulletin, 1892, p. 111. 



