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)
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.
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