138 
Mycologia 
power with progressive development of large conidial areas until 
we reach forms with few ascigerous masses. From these to the 
forms with no asci is the next natural step. This transition is 
suggested by the general morphology of certain forms on which 
asci have been produced in culture. .In every member of the 
series careful observations show at least a narrow fringe of 
hyphae studded with yellow granules, about the margin of the 
developing colony. The yellow is quickly covered by the mass 
of green spores but usually may still be seen with the microscope. 
Color in the Substratum 
Coincident with the change of color in the surface or aerial 
growth we find at the luteum end of the series that yellow to 
orange shades predominate in the substratum. These slowly or 
but partially change to red as the colonies become old. In the 
forms producing conidia only, yellow or orange tones still appear 
in the young colony. The change to red is slow and only partial 
in some forms but towards the purpurogenum end of the series 
the yellow colors are reduced to but transient appearances, re- 
placed quickly and almost completely by red. Observations upon 
these changes must be repeated at intervals during a period of 
two to three weeks. 
Morphology 
The members of this series show the conidiophore character 
of the whole section. Together with color production, however, 
they display an essential uniformity in sterigmatal and conidial 
characters, shared with some but not all the forms showing the 
conidiophore and branching described by Wehmer for the Ver- 
ticillatae. 
Sterigmata 
Each branch or metula bears at its apex a closely packed cluster 
of sterigmata^^ (syn. basidia, conidiiferous cells) or conidium- 
bearing cells. These are closely packed and continue as nearly 
parallel as mechanical conditions permit. They widen gradually 
“ The use of the term sterigmata here follows Westling who has discussed 
this series of terms fully, 1. c., p. 47. 
