274 BOTANICAL GAZETTE [OCTOBER 
zones finally almost black, sometimes brown to olive green, giving a 
very characteristic and prominent black and white zonation with 
a broad white border; reverse color sulphur yellow to reddish 
brown on agar-ammonium nitrate medium; medium colored yel- 
low. Hyphae richly branched, hyaline, septate, 1.7—2.4 mu broad. 
Conidiophores branched, 
am St branches opposite or 
ce b q alternate, two or three 
times forked at the end, 
each end branch _ bearing 
2 or 3 conidiiferous cells, 
each of which bears a 
conidial head at the tip. 
Conidiiferous cells long, 
tapering, abruptly pointed, 
15-20 w long, 3-4 » broad. 
Conidial heads irregularly 
globular, 4-8 yw in diameter 
when young, massed to- 
gether with age to form 
black, granular, masses 
100-500 w in diameter 
which form the black 
zones; .conidiophores at 
Fie. last disappear, leaving only 
tuft of coremia, nat. size; b, tufts of coremia. % SS of spores, whose 
%2.53 ¢, d, conidial fructifications, x 180; ‘ arrangement often simu- 
conidiophores with conidiiferous cells and chains lates chains. Conidia oval 
core 3805 J, coremium, X80; g, conidia, to fusiform, green by trans- 
: mitted light, dark green to 
black in mass, 3-s<6-8 # in diameter.—Fig. 14. 
This was the third most abundant fungus found. It occurred in nearly 
al the plates. Its identification was especially difficult because of the rapidity 
with which the conidial heads massed together, making it hard to determine 
the character of the conidiophores. This was especially confusing on account 
of the chainlike arrangement of the spores in the granular masses. 

black and white zonation was the most conspicuous character in the manner of 
growth. In some cultures, the spore masses fused together in the presence 
