76 A Monograph of the Erysiphaceae 



5. S. PHVTOPTOPHILA Kellemi. & Swingle, [Figs. 124-126J 



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* 5. phytoptophila Kellerm. & Swingle, Journ. Myc. 4: 93. 

 1 888 ; Kellerm. & Swingle, Ann. Rep. Kansas Exper. Sta. 

 i: 310. //. ^. /. y—TJ' 1889; Sacc. Syll. Fung. 9; 365. 

 1891 ; Burr.; Ell. Everh. N. Amer. Pyren. 9. 1892. 



Albigo pJiytoptophila (Kellerm. & Swingle) Kuntze, Revis. Gen. 



Plant. 3^ : 442. 1892. 



Exsicc. : Kellerm. & Swingle, Kans. Fung. 2^ ; Ell. & Everh. 

 .N. Amer. Fung. sec. ser. 2336 ; Rab.-Wint.-Pazsch. Fung. Eur. 

 39545 *Seym. & Earle, Econ. Fung. 148. 



Mycelium evanescent, or subpersistent ; perithecia more or less 

 gregarious, 60-78 fi in diameter, cells small, about 10 n wide, 

 often indistinguishable, inner wall colorless or pale yellow (cells 

 I o- 1 5 // wide, with refractive walls), usually separating entirely 

 from the outer wall ; appendages usually short, sometimes obso- 

 lete, more or less tortuous, pale or dark brown, sometimes as long 

 as 4 times the diameter of the perithecium, septate, occasionally 

 branched ; ascus elliptic-oblong to globose, and 60-75 X 4-~50/^ ! 

 spores 8.20-25 X 12-15 /i. 



Host — Celtis occidentalism on distortions caused by a species of 

 PJiytoptiiS (gall-mite). 



Distribution, — North America : United States — Ohio, Indiana, 

 Illinois (60), Missouri, Iowa, Kansas. 



Kellerman and Swingle (197) give the following description of 

 the present species: "Mycelium very sparse ; perithecia globular, 

 dark brown or black, obscurely reticulate, 60-80 micr., mostly 

 65-75 n^^c^- ^^ diam., appendages few, more or less evanescent, 



dark brown, irregular but usually about 6 micr. in diam., and 

 mostly longer than the diam. of the perithecia, often septate. 

 Asci large, hyaline, broadly oval, containing 8 spores, which are 

 hyaline, oval, regular in size, 15x24-18 micr. Conidial stage: 

 mycelium more abundant, conidiophores hyaline, erect, total 

 height (including conldia) 150-220 micr. by 9-13 micr. in diam,, 

 conidia oval, hyaline, continuous, granular within, 15x21-29, 

 mostly 15x27 micr. 



''The fungus is found associated with Phytopfns (an unde- 



scribed species) on Hackberry {Ccltis). The distortions caused 



by the insect, or perhaps by both insect and fungus, consist of a 



multitude of abnormal, more or less abortive branchlets that 



form a compact knot, Vz-iyi inches in diam.; a few of the 



branchlets are prolonged a few inches and themselves bear smaller 



