University of Wisconsin Digital Collections
Link to University of Wisconsin Digital Collections
Link to University of Wisconsin Digital Collections
The State of Wisconsin Collection

Page View

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 34

 34 Wisconsin Academy of Sciences, Arts and Letters [Vol. 44 
glyptosperma, E. preslii, E. serpyllifolia—largely on the authority
of the late J. J. Davis. Comparison of the Wisconsin material with Fungi
Columbiani No. 380 (on E. preslii) and No. 3234 (on E. nutans) has convinced
me that probably only the Fungi Columbiani specimens really represent P.
fasciculata, and this with wide latitude for spore size variation from the
original description. The large (20—30 x 8—10~4, hyaline, uniseptate,
subfusoid conidia show but a single spore scar, indicating they are non-catentulate.
The conidiophores are pale brown, somewhat flexuous, noticeably and strongly
fascicled, the fascicles being evenly distributed over the leaf surface.
In all the Wisconsin specimens, on the other hand, the conidiophores, although
densely aggregated, are not fascicled and are almost confined to the stems,
or in the case of E. corollata to the leaf midribs. They are in general darker
and are often more strongly angled, but with length variable, the longer
tending to be angled. The conidia are those of typical Cladosporium, pale
olivaceous or olivaceous with two spore scars, indicating catenulation. On
E. corollata they are mostly uniseptate, with a slight constriction at the
septum, subcylindric, 15—20 x 6—7g. On the other species of Wisconsin
Euphorbia mentioned the conidia are almost uniformly continuous and limoniform,
10—16 x 4.5—6.5~~. In my Notes VI (Trans. Wis. Acad. Sci. 36:
252. 1944), while still tentatively adhering to the Passalora conception,
I remarked that the Wisconsin collections would be better assigned to Ciadosporium
spp~ Which species is a question. Cladosporium solutum Link is reported as
occurring on stems of Euphorbia marginata, but I have been unable to find
a description. 
 CERCOSPORA sp., occurring in small amount on leaves of Hypericum ascyron
at Madison, August 28, does not in any particular resemble C. hyperici Tehon
& Daniels, the only species on Hypericum mentioned in Chupp's monograph.
The fungus is hypophyilous on small, rounded, reddish spots. The conidiophores
in lax fascicles, are 50—200 x 4.5—5.5~, multiseptate, several
times geniculate, clear brown, with paler, abruptly conic tips, while the
conidia are from 60—140 x 3—4~a, multiseptate, acicular, hyaline,
with truncate base. 
 ALTERNARIA sp. on Panicum virgatum, collected at Sylvania, Racine Co., August
19, 1953, appears parasitic and is on narrowly elongate white lesions with
a reddish border. There are many lesions per leaf, causing very noticeable
discoloration. Insofar as the spots are concerned, this seems quite similar
to Macrosporium panici Eli. & Ev., as described, (Erythea 4: 28. 1896),
but the fungus itself is a larger, coarser form. 


Go up to Top of Page