58 
Journal of Mycology 
[Vol. 12 
appendages are 5 to 7/x, rarely 10 /x long and about 0.5 /x in 
thickness at the base. In germinating the two middle cells 
become more turgid causing the spore to fall apart between 
them (Fig. 2). The germ tubes grow directly or obliquely 
from the middle septum. (Figs. 3 and 4.) The hyaline end 
cells do not germinate. 
In spite of the discrepancies between description and actual 
structure the fungus was recognized as a species of Dilophospora, 
and agrees in every regard, except a very slight difference in 
size of spores, with de Thumen, Mycotheca universalis No. 
456 D. graminis Desm. on Dactylis glomerata. It also agrees 
with Desmazieres’ figures. 1 ) Saccardo 2 ) gives the measurements 
as 10 x 1.7-2/x, but de Thumen’s specimens contain spores 11.6 
to 13.3 x 2-2.3 jul, while Desmazieres, who was the first to observe 
the spores, gives 12 to 13.3 as the length (1/50 mm. including 
appendages, these being £ to i the length of the spore body) 
and represents them in his illustration as 15 /x long. The differ¬ 
ences in size being so slight, it does not seem justifiable to 
consider the American form as distinct. 
This fungus was described in 1828 for the first time by 
Fries 3 ) as Sphaeria alopecuri and as such is described by Duby, 4 ) 
two years later. In 1840 Desmazieres, 1 ) to whom as well as 
to Fries and Duby the original collector had sent part of his 
material, established for the fungus a new genus Dilophospora 
and applied the specific name graminis citing Sphaeria alopecuri 
Fr. as a synonym. He described the spores as one-celled and 
hyaline in which he has been followed by Corda, 5 ) Bonorden, 6 ) 
Fuckel, 7 ) Allescher 8 ) and Saccardo. 2 ) Bonorden suggested that 
the spores were borne transversely, but this is false. 
Fries 9 ) in 1849 accepts Desmazieres’ generic name, but in¬ 
sists upon his own specific name, saying of Dilophospora : “Plures 
species in culmis graminum in terris calidioribus (Typus D. 
Alopecuri Fr. El. sub Sph.) The name should be accordingly 
Dilophospora alopecuri (Fr.) Fr. 
1 Ann. Sci. Nat. Bot. Ser. I. 14 : 5-7. pi. I. fig. 3 . 1840. 
2 Sylloge Fungorum. 3 :600. 1884. 
3 Elenchus Fungorum. 2: 91. 1828. 
4 Botanicon Gallicum. 2 :694. 1830. 
5 leones Fungorum. 5:30. 1842. 
0 Handbuch der Allgemeinen Mykologie. 227. 1851. 
7 Symbolae Mycologicae. 130. 1869. 
8 Rabenhorst, Kryptogamen-Flora Deutschland, &c. 2te Auflage, 
Bd. 1, Abth. 6. 947-948. 1901. 
9 Summa Veg. Scand. ^: 419. 1849. 
