BULLETIN OF THE BUSSEY INSTITUTION. 407 
vides by means of partitions, parallel to and at right angles to the axis 
of the filament, until a compound body is formed, which resembles the 
spores of the so-called genus Macrosporium. These bodies, which can 
only be described as irregular conglomerations of cells of an oval out- 
line, are produced in great abundance, and average .015 mm. by .025 
mm., but are often much larger, though often smaller. They easily 
drop from their attachments and germinate, each cell being capable of 
producing a germinal tube. Other hyphe, rising at right angles to the 
plane of the membranous portion of the mycelium, grow more and 
more attenuated, and branch at the tip; the terminal cells divide in 
two, as in Plate 1, Fig. 3, ¢, fall from their attachment, and germi- 
nate. ‘This last modification of the hyphe, which is by no means so 
common as the two previously described, will be recognized as cor- 
responding to the so-called genus Helminthosporium, or Cladosporium, 
if we examine before the terminal cells have divided. It is out of the 
question to give specific names to such forms as those just described, | 
which, since the publication of Tulasne’s “Carpologia Fungorum,” 
are known to be different states of development of species of Pyre- 
nomycetes. 
Pycnrp1a. — Besides the forms already described, there are other 
bodies of a more complicated nature. Plate 1, Fig. 3, a, a, represents 
the pycnidia, which are quite numerous in the spots, both on the leaves 
and the stems. ‘Their general shape is spheroidal. They consist of a 
membranous sac of the same color as the darker parts of the myce- 
lium, in which are contained the small bodies, which are represented 
as being discharged in Fig. 3,b. Their average diameter is .04 mm. 
In general appearance, the pycnidia resemble so closely those with 
which every one is familiar in other Pyrenomycetes, that any further 
description is unnecessary. 
StTyLospores. — In examining the larger black spots on the stems 
of the olive, other bodies are seen, — the stylospores, to adopt Tulasne’s 
nomenclature. They are represented in Fig. 1, a, and resemble flasks, 
whose long necks project beyond the mycelium, by which they are sur- 
rounded. ‘They may be recognized by the naked eye, and clearly seen 
with a hand-lens, as the black projecting necks ‘are tolerably conspicu- 
ous. To obtain a good view of them, some of the larger black spots 
must be picked to pieces, and the fragments treated with caustic pot- 
ash, and afterwards hydrochloric acid. The shape of the separate 
