214 



933. Venturia myrtilli Cooke, Syll. I ='", Wt. II '''. 

 On dead leaves of Vaccinium myrtillus. I. Viborg C^/s 03!). 



934. Venturia cincinnata (Fries) Rostrup, Syll. IX«^^ Syn: Sphae- 

 ria cin. Fries S. M. II ^^\ 



On fading leaves of Oxycoccus palustris. S. Gammelmose ('/9 84 see R 06 

 cc 3"). 



Didymosphaeria (incl. Didymella). 



Fuckel supposed a few species of Didymosphaeria to correspond 

 to forms of Diplodia for instance: 



Didymosphaeria diplospora corresp. Diplodia rubi 



— vexata — — mamillana 



any further proof of the correctness of this theory has, however, not 

 appeared. 



935. Didymosphaeria marina (Rostrup)!, Syn: Leptosphaeria 

 mar. R 89 i ''\ Syll. IX ™^ non Ell. &. Ev. 1885, Leptosphaeria danica 

 Berlese 94'^, Leptosphaeria chondri L. K. R. 07, Sphaerella chondri 

 Jones 98, Syll. XVI ''^^ Lit. Cotton 09. 



Peritheciis maculiformiter congestis, parenchymate innatis, lenticu- 

 laribus 125-215 1^ x 110-300 M. Ascis fusoideis 70-80 ^' x 10-15 ^ 

 octosporis, paraphysibus filiformibus, ramosis, obvallatis. Sporidiis 

 subdistichis, ovoideo-oblongatis, medio uniseptatis, 25—40 M X 5—7 H 

 loculo inferiore minore, longe hyalinis, denique fuscidulis. Spermogo- 

 nia Phomam referentia, peritheciis ascophoris immixta, 150—175 K x 

 85—100 ^ spermatiis minutis 4 t^ x 1 fx. 



No doubt the fungus is no Leptosphaeria. The spores and the asci 

 are usually unripe, still I have noticed brown, apparently ripe spores 

 (28 1^ in length and 6 K in breadth) with only one dissepiment ; more 

 than one dissepiment has surely never been noticed either by Rostrup 

 or by others. Nor are the shape and the position of the asci in the 

 perithecia like those of Leptosphaeria. The perithecia are not built 

 like those of the Sphaeriaceae living on phanerogames. There is much 

 to suggest its being a species of Dothideaceae especially a Dothidella. 

 The stroma-like mycelium, the long unripe asci and spores, its appea- 

 rance together with a Placosphaeria-like form of pycnide are signs of 

 this. Contrary to the supposition that it is a Dothidella is the circum- 

 stance that the stroma is certainly started after the perithecia and not 

 previous to them. When I refer this species to Didymosphaeria it is 

 chiefly because it has paraphyses. 



Besides in Denmark it has been found in Ireland (Cotton) and in 

 America, Massachusetts (Jones). 



Rosenvinge has described the conidial stage of Didymosphaeria 

 marina without giving any name to it, I shall call it Phoma marina. 



