596 EDGERTON : GNOMONIA 
(Sacc. & Speg.) Kleb. In no culture in the laboratory nor on 
the material collected on the blackberry was I able to find a trace 
of a conidial stage. 
This fungus was first named by Rehm, Guomonia tetraspora 
Wint. var. Rudi Rehm, but in volume IX of the Sy/oge Fungorum, 
Saccardo considers it a good species and uses the name Guomonia 
Rubi Rehm. The latter name seems to be preferable and will be 
used here. Some of the material was sent to Rehm and the iden- 
tification was confirmed by him. 
Vipear. 
Wy 
. 
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s 
Fic. 3. Gnomonia Rubi Rehm. (2) Asci from perithecia from the blackberry- 
(4) Asci from perithecia in pure culture. (c) Ascospores. (d) Ascospores as they 
appear after losing their appendages. (e) Ascospores germinating. (7) The same 
rai stage. (g) Irregularly thickened mycelial thread, a common condition in old 
cuitures, 
ies 
To prove the connection of the fungus with the disease on the 
canes, inoculation experiments were attempted in 1907. Early in 
the spring, in the greenhouse, some young plants were inoculated 
with a pure culture of the fungus. The plants were very young, 
the canes being perfectly green. This inoculation was a failure ; 
the fungus did not seem to be able to attack the young actively 
growing canes, ; 
Later in the season, on May 9, about ten or twelve blackberry 
