266 BOTANICAL GAZETTE [APRIL - 
every respect with those which are produced in pure cultures, except 
that the perithecia in the pure cultures are more or less overgrown 
with the vegetative hyphae, and this we find to be generally true in 
the case of cultures of perithecia of other fungi, which under natural 
conditions are borne within the tissues of the host. There are several 
genera of pyrenomycetous fungi which have characters so nearly like 
those of Glomerella that they cannot be very satisfactorily dis- 
tinguished from it, and we are of the opinion that some of the species 
already referred to these genera are really the ascogenous stages of 
anthracnoses. Of such genera we may mention Physalospora, Pho- 
matospora, and Guignardia. As already stated, for the present it 
seems advisable to treat these organisms as varieties of the oldest 
species, Glomerella rufomaculans (Berk.) Spauld. & v. Schrenk, which 
was originally described from specimens from the grape. 
U. S. DEPARTMENT OF AGRICULTURE 
Washington, D. C. 
man = crea ae = 
op. ee 
EE — 
