B. chrysanthemoides, B. bipinnata, Cacalia reniformis, C. tuberosity 

 Erechtites hieracifolia, Hieracium, Prenanthes altissima, Lactuca, 

 Taraxacum officinale, Phlox divarieata, Hydrophyllum Virginia 

 cum. Veronica Virginica, Gerardia grandiflora, Brunella vulgaris, 

 Pedicularis lanceolata, Shepherdia argentea. 



Very abundant and widely distributed over the continent, on 

 many widely different hosts. It is, however, variable, and it is quite 

 possible that some forms should be separated as specifically distinct. 

 This is very difficult to do on account of the intermediate forms in 

 perhaps every particular. For the differences between this and 

 S. Humuli, see note appended to the latter. Most specimens on 

 Posacem are easily determined as S. Humuli, while in some others 

 this distinction is not so evident. The size of the perithecia varies 

 much on different hosts, larger than the average on Erechtites 

 and some other Composite^, smaller on Veronica. The appendages 

 vary much in color; sometimes they are nearly or quite hyaline, even 

 when certainly mature, but more often are tinged, sometimes deeply, 

 throughout their entire length, with brown. 



[In figure 3, plate 1, the germinal tube of a conidium is incor- 

 rectly represented as penetrating a stoma, instead of creeping over 

 the surface of the leaf.] 



S. phytoptophila, Kell. & Swingle, Journ. Mycol. IV, p. 93. 



Amphigenous. Mycelium sparse. Conidia about 15 x 27 /i. 

 Perithecia globular, dark colored, with obscure reticulations, and with 

 wall rather fragile, 60-85 /a diam ; appendages few, hyaline or more 

 often fuliginous, irregular, interwoven, sometimes septate, mostly 

 longer than the diameter of the perithecium. Ascus large, broadly 

 oval. Sporidia 8, 18-35 /j. long. . . 



On Celtis occidentalis affected by a Phytoptus forming bushy- 

 branched tufts of twigs. The fungus grows upon these distorted 

 branchlets and apparently not elsewhere on the tree, Kansas (Keller- 

 man and Swingle), and Illinois. Doubtless widely distributed, but 

 not yet reported elsewhere. 



S. lanestris, Hark. Trans. California Acad, of Sci. 1884, p. 20. 



Hypophyllous. Mycelium abundant, firm, felt-like, becoming 

 dull chocolate-brown. Conidia very firm, barrel-shaped, bulging 

 much in the middle. Perithecia variable, about 100 p., wall lined 

 with a distinct, separable layer of hyaline cells; appendages none. 

 Ascus elliptical, thick-walled except at summit. Sporidia 8, oval or 

 subglobose, about 20-24 p long. 

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