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Dicke, Robert J. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XLIV (1955)

Greene, H. C.
Notes on Wisconsin parasitic fungi. XXI,   pp. 29-43 ff. PDF (5.6 MB)


Page 32

 32 Wisconsin Academy of Sciences, Arts and Letters [Vol. 44 
 I am, and always have been, uncertain as to the exact morphologic limits
of Phomopsis, and my uncertainty has in no way been allayed by examination
of the numerous specimens labeled as being of that genus in our herbarium.
I have considered the presence of both alpha- and beta-type spores as being
perhaps the most important feature. In addition, those species which occur
on living tissue, of which I have listed several, tend to have large black
pycnidia on prominent lesions and the alpha spores are subfusoid. 
 STAGONOSPORA sp. on Equisetum hyemale, collected at Madison, August 7, appears
strongly parasitic on the upper portions of stems, which are killed back
and have become whitened. This is perhaps Stago~'iospora equiseti Fautr.
which is inadequately described, except for spore characters which are like
those of the specimen in hand. The spores are said to be cylindric or tapered
at both ends, hyaline, 3-septate, 20—25 x ~ No statement is made
as
to pycnidial characters. In the Wisconsin specimen they are approx. 250—300~~
diam., dark brown, subglobose, senate, sometimes two or three very close
together in a row. 
 STAGONOSPORA BRACHYELYTRI Greene (Trans. Wis. Acad. Sci. 38: 244. 1946)
was first collected in midsummer. In 1954 the fungus was found again in the
type locality in May, strongly infecting the first leaves of shoots of the
host just pushing out of the ground, indicating a possible systematic condition.
 STAGONOSPORA sp. on Abutilon theophrasti was collected August 17 near Black
Earth, Dane Co. I find no report of Stagonospora on this host. The lesions
are sharply defined, and the fungus appears strongly parasitic, but the specimen
is too small for use as a type. The spots are small, rounded, 2—4
mm.
diam., with pale brown centers and a darker brown border. Pycnidia are subglobose,
about 125~ diam., thin-walled, yellowbrown, with a well-marked ostiole surrounded
by a ring of darker cells. The spores are hyaline, cylindric, 18—22
x 3—4~~, and when mature seem to be uniformly 3-septate. 
 PHAEOSEPTORIA FESTUCAE var. ANDROPOGONIS R. Sprague was described in these
notes (Amer. Midl. Nat. 41: 722. 1949) as having pycnospores 60—85~
long, but in a specimen collected near Lodi, Columbia Co., in August, many
of the spores are up to 115/L long. In essential morphology, however, they
do not differ from those of the type. 
 GL0E0sP0RrnM sp. occurs on leaflets of cultivated rose, collected at Madison,
July 1926, by R. Sprague. Descriptive notes are as follows: Spots none; acervuli
hypophyllous, subepidermal, scattered or gregarious, brownish, elevated,
approx. 100—l5Ojh 


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