LEPTOSPHAEKIA. 221 



just over the root, thus reseiublino- the symptoms accompauyiiiL; 

 an attack of Hessian Fly. 



L. tritici Pass, is said by Frank to lie destructive to wheat in (nMuian\. 

 (See also Chtdosponum). 



L. subtecta Wint.^ In Tyrol the perithecia of this sjiecies acconijiany 

 disease of the leaves of Erica carnea. Simultaneously Hypoderma ericae 

 Tub. and Sphaeria ericinn Tub. were found, the former appearing to cause 

 the disease (see p. 234). 



L. anceps Saec On living- hranches of Ribes nignnn. 



L. vitigena (Schulzer). On living tendrils of the vine. 



L. circinans Sacc. (see Rhizoctonia p. 201). 



L stictoides Saec. on Liriodendron tulipiferii is an American .sjjecies. 



Pleospora. 



The black perithecia are not developed on a stroma, and 

 are at first concealed in the host-tissues only. They contain 

 paraphyses and eight-spored asci. The spores are multiseptate, 

 and generally coloured. 



Pleospora hyacinthi Sor.- produces black coatings on the 

 bulb-scales of hyacinth. The mycelium inside the tissues is 

 colourless, but outside is dark red, and its presence causes disease 

 of healthy parts. Certain perithecia which appear on the Imll)- 

 scales in antunni may perhaps belong to this fungus. 



P. tropaeoli Hals, is given as a disease of Tropaeolum in U.S. 

 America.'^ 



P. hesperidearum Catt. The coni(Hal ibrm {Sporuh'sinium 

 hcsj).) ai)pears as a black coating on the orange. 



P. ulmi Fr. {car. minor) Allescher, causes a leaf-spot on young 

 elm-seedlings, and the leaves drop off prematurely. 



P. napi Fuck, is the cause of rape-smut. Leaf-spots carrying 

 conidiul cushions {Sporidesmium exitiomm Kiihn) appear on the 

 rape and other allied root-crops. 



Other "black smut-diseases" have been ascribed to Polydesmus (Spori 

 desmium) exitiosum {var Dcmci) on carrot ; Helminthosporium gramineum 

 Ral)h. causing withering of rye and barley leaves; and Sporidesmium 

 putrefaciens Fuck, which attacks ami kills the young lieart-leaves nf l)eet- 



r<iot. 



iv. Tubeuf, Botan. Centralhlatt, xxi., 1885. 



-Sorauer, Handhtich d. Pjlanzenhankheilen, ii. Aufl., p. .'UO ; and Uiiltmiich. 

 iib. die Ringelkrmd-heii u. d. Jittsufhau d. Hyacinthtn. Leipzig, 1878. 

 ^N. Jersey Agric. Fxper. Sfaf. Rejiort, 13, 1892. 



