Hone: pezizales, phacidiales and tuberales of minn. 117 



2. Rhytisma acerinum (Pers.) Fries, Vetensk. Akad. Handl. 104. 



i8ig. (Plate XIX. Fig. i.) 



Xyloma acerinum Pers. Disp. Metli. Fung. 5. 1797. 



Stroma forming- raised, irregularly circular, black, thick patches 

 on upper surface of the leaves; exciple composed of olive brown 

 cells giving jet black appearance to the exterior, 2 cm. in diameter; 

 ascophores gregarious on stroma, elongate; spores parallel, needle- 

 shaped, obtuse, base acute, hyaline, guttulate, often curved 60-80 x 

 1.5-3 niic. ; paraphyses filiform, curved or wavy, at apex, hyaline. 



On upper surface of various species of Acer leaves, very abun- 

 dant, often destroying whole groves of Acer dasycarpum Ehrh. , 

 Hennepin, Sept. 1898, Freeman; Chisago, Sept. 1891, Sheldon 4248; 

 Hennepin, June 1891, Butters 122; Lincoln, Aug. 1891, Sheldon 

 1343; Brown, July 1891, Sheldon 1075; Winona, July 1884, Holz- 

 inger; Ramsey, Sept. 1908, Hone 1020; Chisago, Oct. 1908. Hone 

 1028; Washington, Oct. 1908, Hone. 1084. 



Exsiccati: Krieger, Fungi Sax. 185; Thiimen, Fungi Austr. 513, 

 260; Thiimen, Mycoth. Univ. 183; Sydow, Mycoth. Alarch. 153; 

 Ellis & Everhart, North American Fungi. 1777; Seymour & Earle, 

 Econ. Fungi. 109. Plates: Tulasne, Sel. Fung. Carp. 3. pi. 15. fig. 

 9-12; DeCandolle, HI. Mem. Gen. Xyloma, pi. 3. fig. 9. 



3. Rhytisma andromedae (Pers.) Fries, Vetensk. Akad. Handl. 104. 



1819. 



Xyloma andromedae Pers. Syn. Meth. Fung. 104. 1801. 



Stroma forming shining black, very irregular patches on upper 

 surface of leaves ; exterior black ; interior white ; ascophores elon- 

 gate ; spores long and narrowly clavate, apex obtuse, lower half 

 tapering, acute, straight or curved, hyaline, continuous, guttulate, 

 50-60 X 5-7 mic. ; paraphyses slender, apex curled, hyaline. 



On upper surface of leaves of Andromeda polifolia; St. Louis, 

 July 1886, Hoi way 186. 



Exsiccati: Thiimen, Mycoth. Univ. 2177; Sydow, Mycoth. March. 

 255 ; Ellis & Everhart, North American Fungi. 2332 ; U. S. Dept. 

 Agri. Div. Veg. Phys. & Path. 99. Plates : DeCandole, HL Mem. 

 Gen. Xyloma. pi. 3. fig. 13. 



4. Rhytisma solidaginis Schwein. Syn. Am. Bor. no. 2034. p. 241. 1834. 

 Stroma forming small black, shining, raised, irregular oval 



patches upon upper surface of the leaves ; to nearly i cm. in diame- 

 ter. 



On leaves of Euthamia graminif olia ; Becker, Aug. 1901, Butters 

 181. 



