DOTHIORACEAE 161 



(1914) established the Plectodiscellaceae, using as the type Flec- 

 todiscella piri, which causes a leaf spot of apple and pear in the 

 Caucasus. Three years later Burkholder (1917, 1917a) described 

 the ascogenous stage of the raspberry anthracnose pathogen, 

 designating it Plectodiscella veiieta, which had previously been 

 known in its conidial aspect as Gloeosporhnn venetinn. Burk- 

 holder showed that monascous locules occur in the stromata 

 which form within the decaying tissues. These stromata become 

 erumpent at maturity and the asci are freed by the wearing away 

 of overlyinsf stromatic tissues, which readily become gelatinous. 



In 1932 Jenkins (1932) pointed out that the genus Plectodi- 

 scella is synonymous with Elsinoe, previously established, and 

 for this reason she changed the name of Woroninchin's Plecto- 

 discella pin to Elsinoe piri. She also established that the conid- 

 ial stages of species of Elsinoe belong to Sphaceloma and not to 

 Gloeosporium, Cladosporium, and other form genera to which 

 they had been assigned. As a result of these findings, Jenkins 

 turned to a critical examination of various related species. She 

 found that the "scab" of Fhaseoliis hinatiis hova Cuba is caused 

 by Elsinoe canavaliae [Jenkins (1931)] and is identical with an 

 organism attacking species of Canavalia in Java, Ceylon, the 

 Malay Peninsula, and the Philippines. Avocado scab is caused 

 by Sphaceloma perseae [Jenkins (1935)]. The scab disease of 

 lemons, sour oranges, and certain other citrus fruits [Bitancourt 

 and Jenkins (1936)] occurring throughout all citrus-growing 

 regions, is induced by Elsinoe fanjccetti {Cladosporium citri), 

 whereas that of sweet orange is caused by E. aiistralis [Bitancourt 

 and Jenkins (1937)]. 



Although the type of angiocarpous development in the Elsi- 

 noeaceae apparently is quite like that in the iVIyriangiaceae, cyto- 

 logic details are still lacking^, and nothingr is known of their 

 sexuality. 



DoTHiORACEAE. The structure of members of this family, in- 

 cluding Dothiora, Bagnisiella, Bagnisiopsis, and Botryosphaeria, 

 was established by Theissen (1916) largely from a study of 

 Botryosphaeria. He found wide structural variation in this genus. 

 In B. ijjflata the locules are scattered throughout the stromatic 

 tissue. In B. mascarensis they are seated upon the surface of the 

 stroma at maturity. In B. ribis the locules are left standing on 

 stipes, and each one is perithecium-like. 



