356 



Mycologia 



This possibly attacks the leaves only after they are weakened 

 by the Cercospora which accompanies it. 



31. Gloeosporium Bartholomaei sp. nov. 

 Spots numerous, sooty, quadrate, 1-3 mm. across, paler below 

 but nearly similar, opaque when held to the light. Acervuli 

 amphigenous but mostly epiphyllous, the spore-masses waxy, 

 honey-colored, in crateriform ruptures of the epidermis. Spores 

 fusoid, subacute, hyaline, the nucleation causing some of them to 

 appear septate, 20-24 X 5-5-6/a, extremes in length 15 to 30^, in 

 width 4-6.5 fx. 



On living leaves of Ribes bracteosum Dougl., Port Orchard, 

 Wash., July, 1912, E. Bartholomew 4763. Type collection, Fungi 

 Columb. 5022. 



32. Gloeosporium Betae Dearn. & Barth. sp. nov. 



Spots circular, conspicuously circinate, dark-gray, sometimes 

 confluent and then large areas of the leaves become sordid yellow, 

 similar on both sides, .5-1 cm. Acervuli innate ; even when their 

 positions cannot be detected with the lens, sections in water 

 usually give one or more oozing cirrhi of spores. Spores abun- 

 dant, hyaline, minutely nucleate, 3.5-5 X 3~4/a. 



A typical Gloeosporium on living leaves of sugar beet, Beta 

 vulgaris Willd., very destructive. Billings, Mont., Aug., 1913, 

 E. Bartholomew 5173. Type collection, Fungi Columb. 5023. 



33. Gloeosporium Crataegi Dearn. & Barth. sp. nov. 



Spots circular, white above with a diffuse, reddish border, red- 

 dish when held to the light and on the under side of the leaf, 

 2-3 mm. in diameter. Acervuli epiphyllous, circular ( 60-90 //.) 

 to hysteriiform (.5-1.5 mm. by 60-1 00 fi ), the sporiferous factors 

 with the spores rupturing the cuticle and rising in a mass from 

 .6 to 1 mm. above the level of the leaf. Conidia hyaline, often 

 nucleate at each end, 4-6 X 2-3 ju. 



On living leaves of Crataegus brevispina (Dougl.) Heller, Van- 

 couver, Wash., Sept., 1912, E. Bartholomew 4957* Type col- 

 lection, Fungi Columb. 5024. 



34. Melanconium Smilacis (Ellis & Ev.) comb. nov. 

 Sphaeropsis Smilacis Ellis & Ev. Jour. Myc. 5 : 149. 1889. 



Examination of a portion of the type collection, H. J. Webber's 



