Parasitic Fungi of Illinois. 419 



On Euphorbia hypericifolia: Union, Oct. 24, 1931. Eu- 

 phorbia corollata: McHenry, Aug. 20, 1198, Aug. 26, 1294, 

 Sept. 1, 1411; Boone, Sept. 2, 1418; McLean, Oct. 7, 1821, Oct. 

 12, 1842; Union, Oct. 21, 1938, Oct. 25, 2005, Oct. 29, 2117; 

 Lee, Sept. 11, 5778; Jo Daviess, Sept. 16, 5943, Sept. 18, 5971. 



This is very common throughout the State, and is easily 

 recognized by its very long, often unbranched, colorless append- 

 ages. Such appendages are also characteristic of the European 

 species M. Astragali, (DC.) Trev. Our specimens closely re- 

 semble specimens of the latter on Astragalus glycyphyllus. 



B. Tips of appendages distinctly recurved when mature. 

 M. erineophila, Peck. 



(Torr. Bull., X., p. 75.) 



Mycelium thin; perithecia 90-100 /tt, fragile, dark, 

 opaque, reticulations obscure; appendages few, 8-12, dark 

 colored except the branches, scarcely equal to the diameter of 

 the perithecium, 4-6 times regularly dichotomous, branches 

 short and rather thick, tips recurved; asci 5-8, oval or ovate, 

 pedicellate, rather small, 35 by 55 p; spores uniformly 8, 

 small. 



Mycelium arachnoid, sub-persistent; perithecia .003 to .004 of an 

 inch broad, sometimes collapsed or pezizseform; appendages 6 to 12, 

 shorter than, or about equal to, the diameter of the perithecia, colored, 

 the tips paler and two or three times dichotomous; asci 4, sometimes 3 

 or 5, eight-spored; spores .0008 to .0009 of an inch long, .00045 to .0005 

 broad, usually containing one or two large nuclei. — Peck, Torr. Bull., 

 X., p. 75. 



On the " Erineum" caused by some species of Phytoptus 

 on the lower sides of the leaves of Fagus ferruginea: Union, 

 Aug. 20, Sept. 20 (Earle); Pulaski, Nov. 4, 2230, 2244, 2245. 



This peculiar species is not uncommon in southern Illinois. 

 So far as is known it has not been collected elsewhere. It has 

 been distributed by Winter as No. 3245 of his " Fungi Europ. et 

 extra Europaei." 

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