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The asci are abundant. usually clavate, sometimes tending to the cylindrical or curved, 
80-100 u x 18-23 u. eight-spored ; they are slightly thickened round the apex, but no canal 
or apical pore could be observed. The asci do not stain blue with iodine; they disappear 
rapidly at maturity, so that one rarely finds an entire ascus containing mature spores ; 
the wall of the ascus seems to break down as soon as the spores are mature. 
The ascospores are more or less distichous, hyaline, ellipsoid or subfusoid, tapering 
abruptly at each end to a blunt apex, 20-21 4 x 8-10 u. There are two to three large 
oil drops in each spore which stain pink with Guéguen’s triple stain, the rest of the spore 
stains a deep blue. 
Fig. 2. 
Asci and spores of Physalusp. ra perseae. 
Fig. 3. 
Section through two pycnidia. 
Pyenidia are found on some of the stem cankers in the place of perithecia or are 
interspersed with them. The pycnidia are single or in small groups: some are spherical or 
sub-spherical with a distinct papilla, that is to say, they are similar to the perithecia : 
others are conical, spherical or elongated, without a papilla (fig. 3). They are formed 
under the epidermis or in the cortical tissues, and are erumpent at maturity. The horizontal 
diameter is 120-130 u, vertically they measure 70-187 u, and there is a double wall, the 
two layers being similar to those described in the perithecia. From the inner wall arises 
