Macrosporium parctsitiaim, Thum . 7 
colour. The colour was at first deeper on those portions most 
exposed to light. They were then easily recognisable with 
the naked eye as small black .spots on the mycelium. 
While the perithecia were thus being formed, many other 
important changes were also taking place on the growing my- 
celium. Besides the growth of the mycelium along the surface 
of the fluid, a large number of hyphae were sent out both up- 
wards into the air, and downwards into the liquid substratum. 
Those that were sent down into the fluid were finer than those 
on which the perithecia were formed. They remained colour- 
less for a long time. In some cases they presented a peculiar 
undulating appearance, which reminded one of the rhizoids of 
a Marchantia. Generally they formed a loose fringe of a light 
colour, hanging down into the fluid. But in some of the flask- 
cultures, where an excessive growth of hyphae took place, 
they formed a thickly interlaced felt of dark brown colour, 
with many young perithecia entirely immersed at first in its 
tissue just under its upper surface. 
The aerial hyphae were generally observed two days after 
the sowing on the central or older part of the mycelium, as 
short white filaments. They were at first more or less erect, 
but as they grew on, they began to trail, forming a cobwebby 
veil over the surface. On these hyphae were produced short 
branches, which were given out perpendicularly, and which 
bore on their tips the M acrosporium-s pores. These fertile 
hyphae were also formed on the mycelium as well as on some 
of the perithecia. The aerial hyphae began to assume a 
light brownish colour at about the time when the spores 
were forming. 
The earlier Macrosporium - spores were observed on the third 
day of a culture. On the fifth day they were ripe, and even 
produced on their surface the secondary spores having all the 
characteristics of the spores themselves. 
The fertile hyphae were similar in size and characters to 
those of the Bermuda specimens, with a few minor variations 
caused by the difference in substrata. They were produced 
in the present case, not in tufts, but scattered singly on the 
