436 PROCEEDINGS OF THE ACADEMY OF [1895. 



Spots small, 1 mm. , white, subconcentrically arranged on larger, 

 definite brown spots, 3-5 mm. diam. Acervuli epiphyllous, erumpent, 

 seated on the white spots, black, 150-200 // diam. Conidia cylin- 

 drical, curved, obtuse, nucleate, hyaline, 35-45 x 3s-4i fi. 



Marsonia Rhamni E. & E. 



On leaves of Rhamnus Purshiana, Renton, Wash., Aug. 9, 1894. 

 Prof. C. V. Piper, No. 59. 



Spots suborbicular, \— 1 cm., whitish in the center, with a broad, 

 dark-purplish border. Acervuli epiphyllous, but also visible below, 

 flesh-colored, 200-250 ,a diam. Conidia oblong or elliptic-oblong, 

 uniseptate, hyaline, 6-8 x 2J— 3 /*, not constricted at the septum. 



Marsonia rubiginosa E. & E. 



On leaves of Salixt Idaho, 1802. A. J. Mulford. 



Spots numerous, small, about 1 mm. diam., or by confluence 

 more, rusty-brown, without any distinct border, more clearly defined 

 on the upper side of the leaf. 



Acervuli numerous, 100-150 ,u diam., amphigenous, but mostly 

 erumpent below. Conidia elongated-piriform, hyaline, uniseptate 

 near the lower end, often slightly curved, acute below, 11-13 x 2]- 

 4£ ;>.. Spores smaller and spots different from any of the other 

 species on willow leaves. Comes nearest M. salidcola Bres. 



Melanconium crinigerum E. & E. 



On bark of dead maple. Ohio, Morgan 1,130. 



Ascervuli subcutaneous, convex, slate-color, 2-3 mm. diam. 

 Conidia, ovate, elliptical or subglobose 25-40 x 22-30 ,", loosely 

 fibrillose, issuing in black cirrhi which resemble tufts of black wool. 

 Found also on maple at Potsdam, N. Y. 

 Melanconium Alni C. & E. 



Sphaeropsis Alni C. & E., Grev. V., p. 50. 



On living bark of Alum serrulata, Newfield, N. J. and on Alnus 

 rhombifolia, Pasadena, Cala., August 1894. Prof. A. J. 

 McClatchie. 



Acervuli perithecioid, minute, ' mm., buried in the inner bark, 

 subeircinate, filled at first with an abundance of subglobose, hyaline 

 sporules 3-4 a diam., and later on producing elliptical or oblong- 

 elliptical, obtuse, brown conidia resembling those of a Sphaeropsis, 

 and borne on stout basidia about 15//. long, 20-25 x 12-15 ,». 



The conidia from each group of acervuli are discharged through a 



