Macrosporium parasitimm , Thiim. 1 1 
in the spores took place, they began to grow noticeably in 
width, and to assume a yellowish colour (Fig. 12 C). At 
about this stage, in some of the spores, a longitudinal par- 
tition was formed for the first time. 
It took just about a month from the beginning of the for- 
mation of a perithecium to the full ripening of its ascospores. 
A large number of the asci, which were often very closely 
packed in the cavity of the perithecium, exerted a considerable 
pressure on the parenchymatous cells along its side, causing 
them to flatten, and also on the paraphyses between them. 
The paraphyses lost a considerable part of their contents. 
Their outline became indistinct, and in some places their cell- 
wall became completely mucilaginous. The same changes 
took place in the basal cells, from which both paraphyses and 
asci were formed. The refractive contents, which had once 
filled these cells, must have been used up in the formation 
and growth of the asci and ascospores. 
The matured asci were cylindrical-oblong in shape, tapering 
at one end into short curved pedicels, which were slightly 
dilated at the point of attachment. Their size ranged from 
120 to 160 m.mm. in length, and from 25 to 30 m.mm. 
in width. The spores were arranged mostly in two ranks, 
but towards the base of the ascus they were frequently one- 
ranked. The spores, even the well-matured, were enveloped 
in a thin layer of protoplasm, which united the whole into a 
group. The spores were elliptical or oblong, obtuse at both 
ends, and 7-septate, with two or three longitudinal partitions 
at the middle portion, and one or two towards both ends. 
They were constricted at about the middle. The upper por- 
tions were always larger than the lower. They were yellowish- 
brown in colour, and in size from 30 to 33 m.mm. in length, 
and 12 to 15 m.mm. in width (Fig. 13). 
In typical cases, the fully matured perithecia were slightly 
depressed globular in form, with short obtusely-conical beaks, 
and with flattened bases. Those perithecia which were 
formed crowded together on a mycelium had longer and 
narrower forms, with prominent beaks. It was not rare to 
