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 Add this item to the list  Cercospora ferruginea Fuckel
Page number:136 
Remarks (internal):Many collections in herbaria in different countries and states are labeled C. ferruginea but are likely to be C. olivacea Otth., C. racemosa, or C. racemosa var. ambrosiae, all of which are distinct from the fungus on Artemisia vulgaris. C. ferruginea differs from C. olivacea Otth., the other species on Artemisia, in being nonfasciculate, having conidiophores swollen near the tips, branched, and with longer, more nearly obclavate conidia. Fuckel , Jahrb.Nassau. Ver. f. Naturk. 27: 20. 1873, connects the conidial stage with Sphaersella ferruginea The Cercospora could well be classed in some other genus. Mr. and Mrs. E. Bartholomew collected a fungus on Franseria chamissonis Less. in Golden Gate Park, California, Aug. 16, 1915, and he distributed it as Fungi Columbiana No. 4902 under the name, C. ferruginea. It seems distinct and probably is an Helminthosporium. 
Description type:Non-original description 
Description:Cercospora ferruginea Fuckel
In Fresenius, Beitrage zur Mykologie p. 93. 1863
Also Hedwigia 2: 134. 1863
Leaf spots indefinite or lacking; fruiting in hypophyllous effuse reddish or ferruginous to dark olivaceous layers, sometimes including the larger part of the leaf surface; stromata not present; conidiophores nonfasciculate, medium dark brown, plainly multiseptate, branched, variously curved or bent but rarely geniculate, often widened near the tip, which is conic and has a medium sized spore scar, 4-6 x 50-250 µm, the widest part near tip ranging from 5 to 9 µm; conidia cylindroobclavate, the shortest ones being distinctly cylindric, pale to medium olivaceous brown, 0-5 but mostly 1-3 septate, straight or nearly so, base rounded to obconic, tip blunt, 5-8 x 15-60 µm, rarely as long as 90 µm.
HOSTS: Artemisia vulgaris L. Among other hosts which have been reported are A. absinthium L., Ambrosia spp., Erigeron tomentosus, Teucrium canadense L., Tanacetum uliginosum Sibth. & Sm., Franseria chamissonis Less., Lobelia puberula Michx., and other unrelated hosts. A close study of these specimens shows that this Cercospora species occurs only on Artemisia, and seemingly only on A. vulgaris.
TYPE: Altersand versus Hostrichiam; Artemisia vulgaris; autumn, 1863. Cotype distributed as Fungi Rhenani No. 120.
DISTRIBUTION: Herbarium specimens indicate that the species is common in many countries and states; but the apparent confusion of hosts makes it difficult to state the distribution with any certainty. I have specimens from Germany, Poland, China, and Ontario (Canada).
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