- 314 — 



of the year 1908 Mr. Larsen called our attention to the fungus, and we 

 happened to find it again in different localities, partly in the neigh- 

 bourhood of Aarhus (Jan. 09), partly near Lyngby, Sealand (Febr. 

 09), in both places on Alnns glutinosa and in company with Ditopella 

 fusispora De Not. By studying the fungus we also came to the result that 

 it is to be classed into the family Gnomoniaceae, but we did not happen 

 to find the fungus described under this family. As the above list of syno- 

 nyms indicates, it is however well known by the mycologists, having been 

 referred to different families under two special names. The name con- 

 fonnis has the priority, and under this name the fungus is referred by 

 Saccardo to the genus Metasphaeria (see above!). In a critical note 

 Saccardo remarks 1. c. : „Eximia species perperam ab auctoribus ut 

 forma Ditopellae fusisporae habita. Gharacteres Metasphaeriae, sed natura 

 potius Calosporae, tamen vere simplex." 



As to the microscopic characters the fungus is really very like a 

 Calospora and it comes therefore quite natural^ when Cooke and Mas see 

 have taken it for an undescribed species of the named genus. Later 

 on examining the Cooke'an originals Berlese has found that the 

 fungus is without stroma, wherefore he has transferred it to the genus 

 Massarina under the Cooke' an species-name (see the synonyms!). 



In examining our rather rich material of this disputed fungus we 

 have come, however, to the result that its right place is under the genus 

 Gnomonia. The wall of the perithecium is namely thin, and paraphyses 

 are quite wanting; further the young asci are lacking the characteristic 

 structure, which is peculiar for the Pleosporaceae, and at the ripe stage 

 the apex of the asci is thickened (about 5^) and distinctly pierced by a porus. 



As commonly stated the fungus has macroscopically a striking like- 

 ness with Ditopella fusispora De Not., in company with which it is very 

 often occurring. At fullripe stage both fungi have a characteristic con- 

 cave bottom of the perithecium, and a slightly developed clypeus can be 

 found in both species (also after P. Larsen). The perithecia of 

 Ditopella are however somewhat smaller (V2 — ^/s mm. while ^U — 1 mm. 

 for the Gnomonia), according to which this fungus by piercing the periderm 

 is forming a less conspicuous rupture. 



Sphaeropsidaceae. 



Diplodina Junci Oud. 



Syn. : Stagonospora juncicola Rostr., Bot. Tidsskr. Bd. 26, p. 312. 

 Diplodina juncicola (Rostr.) Lind, Ann. Myc. V, p. 276. 

 In comparing type-specimina of this species from herb. Oudemans, 

 benevolently committed to us by prof. Moll at Groningen, with the 



