BULLETIN OF THE BUSSEY INSTITUTION. 443 
are discharged through a terminal pore. They are often arranged in 
a regular row, but quite as often they overlap one another irregu- 
larly. The asci themselves are about .12 mm. long, and are rather ab- 
ruptly contracted at the base. The paraphyses are longer than the 
asci, unbranched, and club-shaped at the tip. The spores measure 
from .016 mm. to .02 mm. in length, and from .008 mm. to .010 mm. 
in breadth. They are two-parted, as shown in Plate VIL, Figs. 5 and 6 ; 
one division being uniformly much smaller than the other, and not more 
than one quarter or one third as long. The spores are transparent, 
and slightly granular. As they lie in the ascus, the small end almost 
invariably points downward. Spores which ripen in February ger- 
-minate in the course of from three to five days, when kept suffi- 
ciently moist. The first germinal tube grows invariably from the 
larger of the two divisions of the spore, and generally at the end 
farthest removed from the smaller division; a second tube grows from 
the smaller end; and not unfrequently others grow from the sides 
of the larger division. It must be remarked, that the germinating 
threads have a diameter three or four times as great as that of the 
hyphe in the knot itself. 
StyLosporeEs. — Besides the perithecia, with their asci and spores, 
there are other reproductive bodies found, but not so frequently as the 
former. Between the ascus-bearing perithecia, we occasionally find 
cavities whose walls, not so thick as those of the perithecia, are lined 
with the stylospores, represented in Plate V., Figs. 4 and 5. They 
sometimes cover the whole surface of the cavity ; but more frequently, 
they are in tufts, or on a sort of irregular placenta, which forms 
ridges on the walls. The stylospores, using Tulasne’s nomenclature, 
are on very slender hyaline pedicels of different lengths. They are 
oval, .012 mm. long, by .006 mm. broad, and divided by cross parti- 
tions into three parts. When perfectly ripe, they are of a slightly 
yellowish tinge. The stylospores are of that form which was classed by 
older writers under the genus Hendersonia, which, like Cladosporium, 
is now recognized only as a secondary form of certain Spheriacee. 
We are not able to refer the present form to any described species of 
Hendersonia, and none has hitherto been supposed to be associated 
with the fungus causing the knot. 
SPERMAGONIA. Pyconrp1a.— In winter and spring we find, besides 
the asci and the stylospores, bodies which must be classed under the 
